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  and United Kingdom  show an almost identical pattern. Relationships with age disparity of all kinds have been observed with both Acceptable age gap and women as the older or younger partner. In various cultures, older men and younger women often seek one another for Acceptable age gap or marital relationships. Most men marry women younger than they are; with the difference being between two and three years in Spain,  the UK reporting the difference to be on average about three years, and the US, two and a half.
Another study also showed a higher divorce rate as the age difference rose Acceptable age gap when either the woman was older or the man was older. In AugustMichael 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 A 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.
Explanations for age disparity usually focus on either the rational choice model or the analysis of demographic trends in a society.
The demographic trends are concerned with the gender Acceptable age gap in the society, the marriage squeezeand migration patterns. As people have chosen to marry later, the age differences between couples have increased as well. In a Brown University study, it has been noted that Acceptable age gap social structure of a country determines the age difference between spouses more than any other factor.
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.
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".
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A British psychological study published in Evolution and Human Behavior in concluded that men and women, in general, continued to Acceptable age gap traditional gender roles when searching for mates. 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.
The evolutionary approach, based on the theories of Charles Darwinattempts to explain age disparity in sexual relationships in terms of natural selection Acceptable age gap sexual selection. 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.
However, human males tend to have more parental investment compared to mammal males Acceptable age gap females still tend to have more parental investment. These two theories explain why natural Acceptable age gap 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.
A study conducted by David Buss investigated sex differences in mate preferences in 37 cultures with 10, 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.
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. Females demonstrate a complementary pattern, being willing to accept considerably older males on average 8 years older Acceptable age gap were also willing to accept males slightly younger than themselves on average 5 years younger.
This is somewhat different to our close evolutionary relatives: 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.
Buss attributed the male preference Acceptable age gap 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.
Teenage males also report that their ideal mates would be several years older than themselves.
Buss and Schmitt  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. As they are the higher investing sex, females tend Acceptable age gap be slightly more demanding when picking a mate as predicted by parental investment theory. In contrast to above, in short term mating, females will tend to favour Acceptable age gap that demonstrate physical attractiveness as this displays cues of 'good genes'. Cross-culturally, research has consistently supported the trend in which males prefer to mate with younger females, and females with older males.
Analysing the results further, cross culturally, the average age females prefer to marry is Acceptable age gap however prefer to marry when they are The results from the study therefore show that the mean preferred marriage age difference 3. The preferred age of females is However, in some regions of the world there is Acceptable age gap 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. Table 2 shows that 17 of the 20 countries with the largest age-gaps between spouses practice Acceptable age gapand that males range from 6.
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 females and passing on heterozygous diverse genetics from different females to offspring.
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 eachtherefore the competitive advantage values younger females due to their higher reproductive value. Comparatively in Western societies such as the Acceptable age gap and Europe, there is a trend of smaller age-gaps between spouses, reaching its peak average in Southern Europe of 3.
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 Acceptable age gap 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 Acceptable age gap 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.
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.
It is thought that a trade-off or equilibrium is reached in regards Acceptable age gap 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. 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 Acceptable age gap more resources to provide to the family. 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.