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.
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 ...
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.
Age disparity in sexual relationships is the difference in ages of individuals in sexual relationships.
One of the concerns of relationships with age disparities in some cultures is a perceived difference between people of different age ranges.
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.
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.
These age preferences were confirmed in marriage records with males marrying females younger than them and vice versa.
This study used 21,245 participants between 18 and 65 years of age who were not involved in a close relationship.