You may be surprised to learn, men need women to have children. If women are waiting later to have children, it doesn't mater how old the man is. Further, even if it were a problem only for women, that doesn't make the problem moot.
It confuses the matter to talk about household earnings, which obscure the increase in two-income households. (Two-income households have more income and expenses for a given standard of living, since homemakers are contributing to household earnings and expenses in a shadowed form.)