Women are weaker and slower than men, so that men can outrun, submit and impregnate them in wild

This ensures that humans as a species continue producing offsprings and not go extinct.

If a woman doesn't have baby and ages, her system thinks that she's faster than men, so men are not able to impregnate her. To ensure continuity of the species, she starts falling sick and her quality of life deteriorates. Her system wants to slow her down. It's not the environment but her system which degrades her quality of life.

We already know having a baby kind of "repairs" a woman, there is study on this. If you Google, you'll be able to find it.

While if men when start aging, his body thinks - he's slower so he's not able to impregnate women - so his system increases his quality of life by making him faster, stronger and sharper.

We've seen it when scriptures recommend a man from abstaining from sex to attain superior skills. In my religious, it's documented and we know many high IQ people never had romantic partners and were not interested in producing offsprings.