Dating 25 year age difference
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 complimentary 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).
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.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.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.
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).