Perhaps don't have kids in your 40s. It's pretty mean to have kids at 50 because of the high risk of sickness or death while they're teenagers (or younger). Plus the risks of genetic faults in children rises dramatically for dads or mums much over about 40. After 40 kids will often miss out on having grandparents.

Our society says parents can make whatever choices they like, but having children is one of those places when we should be thinking of others (the kids) not ourselves.

I decided against having kids when I reached 40ish for the above reasons (along with some other reasons).