It is crazy but it’s also quite true. People eschew true adult responsibility for much longer these days. It’s a macro trend.

I know there’s a lot of “whys” but not getting married, not having kids, living with parents, etc all compound to remaining a child in some sense and this is continuing well into the 20s and even 30s for a large portion of the demographic.

When it comes to 19 y/o women the fact most internet people would find it gross that 1) highly fertile and 2) desired by old men - is a reality. We tell old men these women are too young yet also won’t admit it’s because they are in some sense still children.

At least with people in my circle of the US, it feels like there's an increasing infantilizing of people (frequently themselves, I'm a bit guilty of this), particularly in regards to things like marriage and raising a family. Yet, by 19 you'll have either made decisions for yourself or someone else has for you, that will likely put you on track for your entire future career direction (education, interests, college choice, maybe even enlisted in the military).

You don't need to have given "definitive thought" to your entire future to not be a child anymore.