The wall is a real thing, and it comes for all of us, not just women.
It doesn't come for everyone at the same age, but at some point women will go from looking young and like someone you'd want to start a family with to looking like an old lady. I've seen 45 year old women it hasn't happened to yet and 27 year old women it has.
For men, it's roughly the same except there's just some point where they start looking like feeble old men.