I'm a 40-year-old male and I put a stop to that a few years ago (vasectomy). My kids are now becoming teenagers and they will be grown up and out of the house while I am still in my 40s. It's been a joy having them but I'll be damned if I start all over again at age 50. My wife and I are looking very much forward to a long and happy life together with the kids grown. We'll get to travel again and go out to eat wherever we want and fix up our home the way we want it. Who knows, we might even move out into the country where we don't have to worry about how the school systems are or whether there are kids in the neighborhood (for our kids to play with).
It horrifies me to think of having kids to raise when I am in my 50s. To each their own, I guess. But God bless them, they're going to need it.