I tried to throw in an "often" in my statement to leave room for exceptions, because there are always exceptions.
But I seem to know an increasing number of people that aren't having kids until they are 45-50, just because...
Sometimes they remarried, and apparently need a set of kids with the new spouse, sometimes they just didn't get around to it earlier. Fewer and fewer seem to have thought about the repercussions of this decision in their own lives, much less their kids' lives.
They just finally decided they wanted kids, so they had them. They had the childhood they wanted, they had the career they wanted, they lived how they wanted, and now feel they need the kids they want. They have no answers for questions concerning finances, health issues, time commitments, lifestyle choices, etc... when it comes to adding kids to their equation. Neither do most young people, but at 45-50, you should really know better.
But I also agree, there is still a lot of life to learn at 22 when a lot of "kids" think they're ready to have kids.
Also, there is no such thing as a perfect parent, no matter the age. We all screw our kids up in 1 way or another, hopefully we don't mess them up too badly.