Preferences for younger female mates is observed in species that exhibit long-term reproductive pair bonds (humans & hamadryas baboons); preference for older females is observed in species that mate promiscuously (chimps & savannah baboons)

The Effects of Age on Mate Choice Across Primate Species and its Correlation to Mating Systems. Ece Kremers. BSc Thesis, Univ. of Minnesota, Spring 2021. https://static1.squarespace.com/static/593ffd7ac534a5e73da04ccf/t/608c24f148a2f16ef8409d8f/1619797234523/

Age can be an important factor in mate choice as it affects experience, access to resources and reproductive value. The hypothesis of this thesis is that in species with long-term mating bonds, males will prefer to mate with younger females whereas in species that mate promiscuously, male will prefer to mate older females. Tackling this question of effect age has on mate choice will help contribute to knowledge on mating behavior and mate choice in primates. The methods for this thesis included gathering evidence from the scientific literature on mate patterns and mate choice in humans (Homo sapiens), chimpanzees (Pan troglodytes), hamadryas baboons (Papio hamadryas), and savannah baboons. Due to the large variation in human behavior across the globe, a cross-cultural analysis is used to draw conclusions regarding how men tend to perceive attractiveness in terms of age and how they choose potential reproductive partners. Similarities and difference in mating patterns and perception of attractiveness in primate are examined. Cross-cultural analysis concluded men generally find youthfulness attractive. Preferences for younger female mates is observed in species that exhibit long-term reproductive pair bonds (humans and hamadryas baboons), whereas preference for older females is observed in species that mate promiscuously (chimpanzees and savannah baboons). Females across all species prefer to mate in way that increase the survival of their offspring. For species with long term pair bonds, this means a preferences for males of high social status, independent of what age. In species that don’t experience long-term pair bonds, this means mating with many males in order to confuse paternity and reduce the risk of infanticide. However, in most primate species (those other than humans), it can be challenging to determine female mate preferences are because of the suppression of female choice through sexual coercion and male-male competition.