It also depends on the person. I was not an adult at 27. I realized I was one at 32 though.

Kids at 27 would have been a bad bad idea. Kids at 32 as well (wrong partner). I’m even older now but I am with the right partner and naturally want kids now. Before her, the topic wouldn’t even cross my mind.

I think it’s really hard to give general advice if one doesn’t mention how their advice interacts with other variables