I suspect that people who haven't had kids will not like to admit that they have any regrets about their decision, just like you will rarely find a parent that will say they wish they hadn't had a child.
Once you're over a certain age you can't really change your mind. Some people decide to focus on their careers, but becoming a parent doesn't mean you won't reach your career goals.
The only issue I see is you taking the way others live their lives so personally lol
> Of course you aren't concerned NOW...in 30 or 40 years you certainly will be.
Looks like you've never met people who are happy without having kids. Meet some and come back to me, and I think our convo will be more productive