Men need to provide shelter to protect the women and their offsprings. Younger men may have enough energy to build the shelter, but usually they can accumulate more resources when they are older.
Man may prefer better looking women to carry the offspring because it implies better genes, which including better body shape, height, symmetrical face, etc. for men and women. Thus, the family line can become stronger and last longer. It also means the family has more chance to become more successful.
All these sound unfair to women, maybe in the old days, it began in this way and gender issue is more recent concern. And maybe the traditional believes are imbedded in our mind.
-Lilac
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Age, Sex, Looks, and Attraction: A Puzzle for Evolutionary Psychology, by Bryan Caplan
EconLog
Evolutionary psychology has a simple explanation for why men value women's youth far more than the reverse: Menopause. Females' fertility declines sharply during their thirties, and largely vanishes in their forties. Males' fertility, in contrast, declines more slowly, and does not asymptote to zero. We're largely the descendants of men who liked young women, and woman who weren't so picky about men's age.
So far, so good. But this story fails to explain another key stylized fact: Conditioning on age, men care more about looks than women. Since age and looks are strongly negatively correlated for women, it's easy to treat age and looks as a single package. But they're distinct. A person can look very young and very ugly at the same time. So why do men care so much about how women look, strongly preferring a beautiful 25-year-old to a plain 25-year-old?
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