My wife and I had two kids, when she was 27 and 29 YO. Right before she hit 40, the clock hit again in a big way. This time around, it took us nearly 3 years to conceive, and the last 12 months were difficult, i.e. finger pointing everywhere.
Becoming a dad again at 48 was never in my plan, raising kids is meant for younger parents. He's now 17, and a senior in HS. We're quite a contrast to most of the parents who are in their 40s.
No regrets, of course. IMO, a woman's biological clock is the second most powerful force in the universe, right behind compound interest. A man's sex drive comes in a distant third IMO.
I expect her to go the same way. I think 23 seems old to me because I had my daughter at 19. Kids today aren’t as mature as we were at 19. She still has plenty of time to change her mind.
Try becoming a mom and dad PERIOD at that elder age. At least yours had elder siblings to “help” and draw a connection to that makes people not look at you as funny. He’s just the youngest of the lot, not the only (or first LOL). We’re some 10 years older than most of our school parents, and people our age are often having college-age kids. Odd man out.