I’d sorta agree on the literal wording of “…other people might not be mentally developed enough to make that decision until age 19 or 20.” I was chatting with people in their 30s-50s when I was 16-18. I was lying about my age to them all, but when I did hit 18 and I met up with someone (and got over the crisis of identity and and cracking the egg) I came to the conclusion a few years later that I really wasn’t ready to make that decision. I don’t regret it at this point since experimenting ended up being a net positive for me in the end, I might have reached it in a bit less of a chaotic manner since things were already moving towards the egg cracking anyway.