We don't... usually give the body age out very often because it's one of those things that people will judge you on without realizing they're judging you based on it. But the idea of what age says about maturity is so relative. I mean, the extended period between puberty and adulthood in Western society nowadays is kinda anomalous, historically speaking; so when someone says they consider someone of 18 to be a child, my reaction tends to be confusion. Because... 'mature,' where I'm from, myself, means you're married and have children, etc, same kinds of things it tends to mean here; except that tends to start around age 15, where I'm from. And someone can be young and handle some situations better than a lot of people twice their age will. And it's also completely possible for someone to be hundreds of years old and entirely lack certain kinds of common sense.