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 ...
A study released in 2003 by the United Kingdom's Office for National Statistics concluded that the proportion of women in England and Wales marrying younger men rose from 15% to 26% between 19.
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.
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.
The theory predicts that preferred mate choices have evolved to focus on reproductive potential and reproductive investment of members of the opposite sex.
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.In fact, I think the power dynamic works out really well in the case of older-woman younger-man. Because a man is always physically more powerful than the woman.Also, a man almost always has something of an emotional advantage over a female, in the sense that women are biochemically predisposed to get more attached after sex; blame it on the oxytocin. Census Bureau.) In other words, there will be a dearth of women.The study found very few instances of older women pursuing much younger men and vice versa.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).Age disparity in sexual relationships is the difference in ages of individuals in sexual relationships.