I know plenty of people that had kids in their 20's - still didn't 'grow up' until their 30's. Just because they're not partying anymore doesn't mean they still don't act like adolescents when navigating complicated situations they're in (because they're had kids before they were necessarily 'ready') compared with someone in their 30's. I would argue that taking away that time in your late 20's where you can more easily make mistakes and try new things (while also having a bit of stability in terms of money) before having kids will lead to less maturity rather than more long term.

Probably not, the comment read more as a way to rant, self-boast, and judge others' lifestyles than anything insightful.