I've always heard this as a kid/young adult but as I've grown older, I've noticed that most people don't ever mature (well, at least not until 35-ish) so I've s

I've always heard this as a kid/young adult but as I've grown older, I've noticed that most people don't ever mature (well, at least not until 35-ish) so I've started doubting all claims and folk-wisdom about maturity pretty much wholesale...