[He agrees with that sentiment — not the same, but similar. And perhaps there are others here who could share that experience, living in those worlds, but Sasuke doesn't know them. Doesn't trust them.]

I wouldn't say that it's important to me, but I've seen it discussed here. The age at which one is considered an adult. It confused me, because nothing like that truly existed in my own world. Someone's level of maturity and life experiences mattered more, as well as the age they became fully-fledged shinobi. For me, I graduated when I was twelve.

[Still, he often considers his own beginning even younger than that, when his childlike view of the world was shattered by cold reality.]

I'm eighteen now, though I spent time in another dimension and prior to that I was in prison, so it's not something I can say I've accurately tracked. [What is time, really.] Some still consider this to be young — so I thought that I should ask.