Dating a girl four years younger
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.A study conducted by David Buss investigated sex differences in mate preferences in 37 cultures with 10,047 participants.
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.
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.
In females, relative youth and physical attractiveness (which males valued more compared to females) demonstrated cues for fertility and high reproductive capacity.
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-twenties.