What will happen to human if men above 40 are having babies while women in their 30s are childless? Wouldn't it be better to have the best whether it?

Wouldn't it be better to have the smartest kids?

old sperms are bad

What will happen to human if men above 40 are having babies while women in their 30s are childless? Wouldn't it be better to have the best whether it?
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