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Age disparity in sexual relationships is the difference in ages of individuals in sexual relationships. Concepts of these relationships, including what defines an age disparity, have developed over time and vary among societies. Differences in age preferences for mates can stem from evolutionary mating strategies and age preferences in sexual partners may vary cross-culturally. There are also social theories for age differences in relationships as well as suggested reasons for 'alternative' age-hypogamous relationships. Age-disparity relationships have been documented for most of recorded history and have been regarded with a wide range of attitudes dependent on sociocultural norms and legal systems.
Data in Australia[2] and the United Kingdom[3] show an almost identical pattern.
Relationships with age disparity of all kinds have been observed with both men and women as the older or younger partner. In various cultures, older men and younger women often seek one another for sexual or marital relationships.[4] Older women sometimes date younger men as well,[5] and in both cases wealth and physical attractiveness are often relevant.[6] Because most men are interested in women in their 20s, adolescent boys are generally sexually interested in women somewhat older than they are.[7] Older men also display an interest in women of their own age.[8]
Most men marry women younger than they are; with the difference being between two and three years in Spain,[9] the UK reporting the difference to be on average about three years, and the US, two and a half.[10][11] The pattern was also confirmed for the rest of the world, with the gap being largest in Africa.[12] A study released in 2003 by the UK's Office for National Statistics concluded that the proportion of women in England and Wales marrying younger men rose from 15% to 26% between 1963 and 1998. Another study also showed a higher divorce rate as the age difference rose for when either the woman was older or the man was older.[13][14] A 2008 study, however, concluded that the difference is not significant.[15][16]
In August 2010, Michael Dunn of the University of Wales Institute, Cardiff completed and released the results of a study on age disparity in dating. Dunn concluded that "Not once across all ages and countries ... did females show a preference for males significantly younger than male preferences for females" and that there was a "consistent cross-cultural preference by women for at least same-age or significantly older men". A 2003 AARP study reported that 34% of women over 39 years old were dating younger men.[17]
A 2011 study suggested that marriage of younger men by women is positively correlated with decreased longevity, particularly for the woman, though married individuals generally still have longer lifespans than singles.[18]
Explanations for age disparity usually focus on either the rational choice model or the analysis of demographic trends in a society.[9] The rational choice model suggests that people look for partners who can provide for them in their life (bread-winners); as men traditionally earn more as they get older, women will therefore prefer older men.[9] This factor is diminishing as more women enter the labor force. The demographic trends are concerned with the sex ratio in the society, the marriage squeeze, and migration patterns.[9] Another explanation concerns cultural values: the higher the value placed in having children, the higher the age gap will be.[12]
As people have chosen to marry later, the age differences between couples have increased as well.[9][15]
In a Brown University study, it has been noted that the social structure of a country determines the age difference between spouses more than any other factor.[19] One of the concerns of relationships with age disparities in some cultures is a perceived difference between people of different age ranges. These differences may be sexual, financial or social in nature. Gender roles may complicate this even further. Socially, a society with a difference in wealth distribution between older and younger people may affect the dynamics of the relationship.[20]
Although the "cougar" theme, in which older women date much younger men, is often portrayed in the media as a widespread and established facet of modern Western culture, at least one academic study has found the concept to be a "myth". A British psychological study published in Evolution and Human Behavior in 2010 concluded that men and women, in general, continued to follow traditional gender roles when searching for mates.[21] The study found that, as supported by other academic studies, most men preferred younger, physically attractive women, while most women, of any age, preferred successful, established men their age or older. The study found very few instances of older women pursuing much younger men and vice versa.[22] The study has been criticized, however, for limiting their results to online dating profiles, which are traditionally not used by those seeking older or younger partners, and for excluding the United States from the study.[23][24][25]
The evolutionary approach, based on the theories of Charles Darwin, attempts to explain age disparity in sexual relationships in terms of natural selection and sexual selection.[26][27] Within sexual selection Darwin identified a further two mechanisms which are important factors in the evolution of sex differences (sexual dimorphism): intrasexual selection (involve competition with those of the same sex over access to mates) and intersexual choice (discriminative choice of mating partners).[28] Life History theory[29] (that includes Parental Investment Theory)[30] provides an explanation for the above mechanisms and strategies adopted by individuals, leading to age disparity in relationships. Life History theory posits that individuals have to divide energy and resources between activities (as energy and resources devoted to one task cannot be used for another task) and this is shaped by natural selection.[31]
Parental Investment Theory refers to the value that is placed on a potential mate based on reproductive potential and reproductive investment. The theory predicts that preferred mate choices have evolved to focus on reproductive potential and reproductive investment of members of the opposite sex.[30] This theory predicts both intrasexual selection and intersexual choice due to differences in parental investment; typically there is competition among members of the lower investing sex (generally males) over the parental investment of the higher investing sex (generally females) who will be more selective in their mate choice. However, human males tend to have more parental investment compared to mammal males (although females still tend to have more parental investment).[32] Thus, both sexes will have to compete and be selective in mate choices. These two theories explain why natural and sexual selection acts slightly differently on the two sexes so that they display different preferences. For example, different age preferences may be a result of sex differences in mate values assigned to the opposite sex at those ages.[30]
A study conducted by David Buss investigated sex differences in mate preferences in 37 cultures with 10,047 participants. In all 37 cultures it was found that males preferred females younger than themselves and females preferred males older than themselves. These age preferences were confirmed in marriage records with males marrying females younger than them and vice versa.[33] A more recent study has supported these findings, conducted by Schwarz and Hassebrauck.[34] This study used 21,245 participants between 18 and 65 years of age who were not involved in a close relationship. As well as asking participants a number of questions on mate selection criteria, they also had to provide the oldest and youngest partner they would accept. It was found that for all ages males were willing to accept females that are slightly older than they are (on average 4.5 years older), but they accept females considerably younger than their own age (on average 10 years younger). Females demonstrate a complementary pattern, being willing to accept considerably older males (on average 8 years older) and were also willing to accept males slightly younger than themselves (on average 5 years younger). This is somewhat different to our close evolutionary relatives: chimpanzees. Male chimpanzees tend to prefer older females than younger and it is suggested that specific cues of female mate value are very different to humans.[35]
Buss attributed the male preference for younger females to certain youthful cues. In females, relative youth and physical attractiveness (which males valued more compared to females) demonstrated cues for fertility and high reproductive capacity.[33] Buss stated the specific age preference of around 25 years implied that fertility was a stronger ultimate cause of mate preference than reproductive value as data suggested that fertility peaks in females around mid-20s.[33] From a life history theory perspective, females that display these cues are judged to be more capable of reproductive investment.[36] This notion of age preference due to peak fertility is supported by Kenrick, Keefe, Gabrielidis, and Cornelius's study, which found that although teenage males would accept a mate slightly younger than they are, there was a wider range of preference for ages above their own. Teenage males also report that their ideal mates would be several years older than they are.[37]
Buss and Schmitt[38] stress that although long-term mating relationships are common for humans, there are both short-term and long-term mating relationships. Buss and Schmitt provided a Sexual Strategies Theory that describes the two sexes as having evolved distinct psychological mechanisms that underlie the strategies for short- and long-term mating. This theory is directly relevant and compatible with those two already mentioned, Life History and Parental Investment.[39][40] Males tend to appear oriented towards short-term mating (greater desire for short-term mates than women, prefer larger number of sexual partners, and take less time to consent to sexual intercourse[40]) and this appears to solve a number of adaptive problems including using fewer resources to access a mate.[38] Although there are a number of reproductive advantages to short-term mating, males still pursue long-term mates, and this is due to the possibility of monopolizing a female's lifetime reproductive resources.[38] Consistent with findings, for both short-term and long-term mates, males prefer younger females (reproductively valuable).[38][41]
As they are the higher-investing sex, females tend to be slightly more demanding when picking a mate (as predicted by parental investment theory).[32] They also tend to have a more difficult task of evaluating a male's reproductive value accurately based on physical appearance, as age tends to have fewer constraints on a male's reproductive resources.[36] Buss attributed the older age preference to older males displaying characteristics of high providing-capacity[33] such as status and resources.[34] In terms of short-term and long-term mating, females tend to be oriented towards long-term mating due to the costs incurred from short-term mating.[38] Although some of these costs will be the same for males and females (risk of STIs and impairing long term mate value), the costs for women will be more severe due to paternity uncertainty (cues of multiple mates will be disfavoured by males).[38]
In contrast to above, in short-term mating, females will tend to favour males that demonstrate physical attractiveness, as this displays cues of 'good genes'.[38] Cues of good genes tend to be typically associated with older males[43] such as facial masculinity and cheek-bone prominence.[44] Buss and Schmitt found similar female preferences for long-term mating which supports the notion that, for long-term relationships, females prefer cues of high resource capacity, one of which is age.[38]
Cross-culturally, research has consistently supported the trend in which males prefer to mate with younger females, and females with older males.[28] In a cross-cultural study that covered 37 countries,[45] preferences for age differences were measured and research supported the theory that people prefer to marry close to the age when female fertility is at its highest (24–25 years). Analysing the results further, cross culturally, the average age females prefer to marry is 25.4 years old, and they prefer a mate 3.4 years older than themselves, therefore their preferred mate would be aged 28.8 years of age. Males however prefer to marry when they are 27.5 years old, and a female to be 2.7 years younger than themselves, yielding their preferred mate to be 24.8 years old. The results from the study therefore show that the mean preferred marriage age difference (3.04 years averaging male and female preferred age) corresponds very closely with the actual mean marriage age difference (2.99). The preferred age of females is 24.8 years and the actual average age females marry is 25.3 years old (and 28.2 for males) which actually falls directly on the age where females are most fertile, so the sexes have evolutionarily adapted mating preferences that maximise reproductivity.
The United Nations Marriage Statistics Department measures the SMAM difference[42] (Singulate Mean Age Marriage difference: the difference in average age at first marriage between men and women) across the main regions in the world (refer to Table. 1).
However, in some regions of the world there is a substantially larger age gap between marriage partners in that males are much older than their wife (or wives). A theory that can explain this finding from an evolutionary perspective is the parasite-stress theory which explains that an increase of infectious disease can cause humans to evolve selectively according to these pressures. Evidence also shows that as disease risk gets higher, it puts a level of stress on mating selection and increases the use of polygamy.[46]
Table 2 shows that 17 of the 20 countries with the largest age-gaps between spouses practice polygyny, and that males range from 6.1 to 9.2 years older than their partners. In regions such as Sub-Saharan Africa the use of polygyny is commonly practiced as a consequence of high sex-ratios (more males born per 100 females) and passing on heterozygous (diverse) genetics from different females to offspring.[47] When disease is prevalent, if a male is producing offspring with a more diverse range of alleles, offspring will be more likely to withstand mortality from disease and continue the family line. Another reason that polygynous communities have larger age-gaps between spouses is that intrasexual competition for females increases as fewer females remain on the marriage market (with males having more than one wife each), therefore the competitive advantage values younger females due to their higher reproductive value.[48] As the competition for younger women becomes more common, the age in females' first marriage lower as older men seek younger and younger females.
Comparatively in Western societies such as the US and Europe, there is a trend of smaller age-gaps between spouses, reaching its peak average in Southern Europe of 3.3 years. Using the same pathogen-stress model, there is a lower prevalence of disease in these economically developed areas, and therefore a reduced stress on reproduction for survival. Additionally, it is common to see monogamous relationships widely in more modern societies as there are more women in the marriage market and polygamy is illegal throughout most of Europe and the United States.
As access to education increases worldwide, the age of marriage increases with it, with more of the youth staying in education for longer. The mean age of marriage in Europe is well above 25, and averaging at 30 in Nordic countries, however this may also be due to the increase of cohabitation in European countries. In some countries in Europe such as France, Netherlands, United Kingdom, Norway, Estonia, Finland and Denmark, 20–30% of women aged 20–34 are cohabiting as opposed to legally marrying.[49] In addition to this with the gender pay gap decreasing, more women work equal hours (average of 40 hours in Europe and the US) to males and looking less for males with financial resources.[49]
In regions such as the Caribbean and Latin America there is a lower SMAM difference than expected; however, there are also a large proportion of partners living in consensual unions; 24% in Brazil, 20% in Nicaragua and 18% in Dominican Republic.[50]
A 2011 study suggested that age disparity in marriage is positively correlated with decreased longevity, particularly for women, though married individuals still have longer lifespans than singles.[18]
Social structural origin theory argues that the underlying cause of sex-differentiated behaviour is the concentration of men and women in differing roles in society. It has been argued that a reason gender roles are so prevalent in society is that the expectations of gender roles can become internalised in a person's self-concept and personality.[51] In a Brown University study, it has been noted that the social structure of a country determines the age difference between spouses more than any other factor.[52] In regards to mate selection, social structural theory supports the idea that individuals aim to maximise what they can provide in the relationship in an environment that is limiting their utilities through expected gender roles in society and marriage.[53]
It is thought that a trade-off or equilibrium is reached in regards to what each gender brings to the mating partnership and that this equilibrium is most likely to be reached with a trade-off of ages when selecting a mate.[54] Women are said to trade youth and physical attractiveness for economic security in their male partner.[55] This economic approach to choosing a partner ultimately depends on the marital or family system that is adopted by society. Women and men tend to seek a partner that will fit in with their society's sexual division of labour. For example, a marital system based on males being the provider and females the domestic worker, favours an age gap in the relationship. An older male is more likely to have more resources to provide to the family.[53]
The rational choice model also suggests that people look for partners who can provide for them in their life (bread-winners); as men traditionally earn more as they get older, women will therefore prefer older men.[56] This factor is diminishing as more women enter the labour force and the gender pay gap decreases.[56]
Age-hypogamy defines a relationship where the woman is the older partner, the oppos
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