Regarding marriage at 23, I have to comment because I got married at 23.
But, I
never planned to get married at that age. It just worked out that I met my ideal man and there wasn't much point in putting it off.
We've been married 7 years now, and we do not have kids. That's one thing that I knew wasn't going to happen right away. I still don't know when we'll have kid(s), but I know I'm a lot more ready now than I was 7 years ago. And, I'm so happy that we have had all these wonderful years just the two of us.
I would never advise someone to get married young, but if you've found the right person you know it, and there is nothing wrong with changing your plans to accomodate a change in situation. The bottom line is no one has any business being married until the time is right, and 'the time' varies from one individual to another, and completely depends on when you meet the right person to get married to. It doesn't work out for everyone, but I have no regrets at all.