You'd probably have to ask him - but in my world, we're considered adults at 15, and I get the impression it's not very different where Malik comes from.

As far as younger Travelers... Jaina, Phillip, Pod, and Maria are all younger than you, I think. I'm not entirely certain how old Robin is. And then I think there's a new D'Angeline kid around, but I'm not sure what his name is. [Since he ran away as soon as he saw Armin.]