Because of social factors which stem from biological evolution factors.
Social factors, its more "normal" to see an old man like Hugh Hefner having a younger girlfriend. Its a sign of male virility despite age, a positive. However, if you do a 180, this doesn't apply for females, hence its "less normal" and hence less commonplace.
Why is this so? This is where biological evolution factors come into play. Male virility despite old age ==> Able to create offspring, so who cares? Again, this doesn't apply for females because the older you are, the less fertile you are able to conceive a child. Hence most mothers are young mothers.
Hence this is why most males will go for younger females.
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