Dating an older partner
Certainly, anyone deliberately looking for a mate to breed with must pick someone of an age of likely fertility.
Moreover, senior men, even during prehistoric times, often had access to relationships and resources which would allow for them to foster the growth of their offspring.
According to Business Insider, evolutionary psychologists say that younger women and older men often get together because while fertility lasts only from puberty to menopause in women, it starts at puberty and can extend long into midlife for lots of men.
In keeping with modern American mores, a folk formula (sometimes referred to as the Trophy Rule) seems to have evolved so as to compute correct disparities of age between older and younger partners, this being "divide by two and add seven", that is, the younger partner in a relationship should be at least seven years older than half the older partner's age, else the relationship is liable to be subject to moral disapprobation.
The United States Census Bureau's March 2000 statistics show that only 800,000 unmarried American couples are more than five years divergent in age, and 7 in 100 of women who have married more than once have a husband six or more years younger than they.
That means there’s a strategic advantage for women to snag an older gent—he’s had more time to accumulate resources and stability than his younger counterparts, which could make him a more viable partner and father.
Plus, a 2010 study by University of Dundee in Scotland found that as women become more financially independent, their tastes skew toward older—and better-looking—men.
Age disparity in extreme cases may be seen as dysfunctional (a paraphilia) if such relationships are pursued to the exclusion of all others and to the detriment of the partners.