Probably in terms of biology yes, babies are likely(?) to be physically healthier and births easier?
But early 20's is barely out of school.
I didn't graduate (long degree) until I was 23. Then I worked abroad for a couple of years in fashion design, then came home & I had a great time for 2 decades, working, marrying, divorcing, dating, masters, travelling, lived in a few different places, bought a decent house in a decent area (all paid off now) etc.
I like children and I love my child, but I don't really like the drudgery of parenting. I love moments like splashing in puddles, covering ourselves in paint (ironically I think I'm much more immature than a lot of mums!) having fun together, the tender moments, spending time just hanging out, the cuddles, funny conversations and bathtime.
But the constant tidying, meal prep, admin, never leaving the house without bags and bags of stuff, having to chase down missing gloves, hats, wellies and coats, the complete lack of freedom is so fucking dull. I imagine having a school age child all that stuff is even more boring.
I had a creative career which paid the bills but wasn't particularly stable as I worked for myself, now I have to have a better paid job, which I do enjoy and is interesting, but I'm stuck on my bum in front of a screen because that's what pays the best within my skill set, and that's not really what I wanted my life to be, it's not creative or fulfilling in the same way now I have a boss and work on a computer all day. So I'm really glad I can look back and think, yes I did do what I was born to do at one point in my life, I did try and I did get that chance.
I have no judgement at all about when other women have children (I don't agree with surrogacy and I'm not very impressed by rich old men having second or third families with women young enough to be their grandchild, I do judge then
) but everyone else do your thing.
I think being a mother is an incredible thing to do, and we should all be supporting each other. Because the role is huge and encompasses so much, going into it when YOU are ready is much more important than your DOB.
But I personally would have been devastated to have been a mother in my twenties, absolutely gutted.
I think if you're the type of family that are very close, all live close together and the expectation is that you finish school/uni and then you marry the boy next door and have children, can afford to buy a house, then maybe having children doesn't feel so limiting? I come from a family that is the opposite so that's what I'm influenced by.
Also wasn't bothered about having my own biological child, so the clock ticking or meeting the right man/father wasn't really something I ever thought about.