[quote=@Hael]
So, what human-age should we behave as? Toddlers? Teenagers? Early twenties?

Grumpy old men?
[/quote]

You don't know anything about the world, but you have enough innate information that you can skip the "shitting yourself and crying for food" stage. Maturity itself is up to you, though a cynical war-vet type of demeanor wouldn't exactly make sense for someone whose yet to experience reality.