Usually it manifests during puberty. I'm basing a lot of it on the X-Men in styles of powers and development. I'm just not much of a comic reader, thus the need for an original universe (avoiding butthurt if I get something wrong in a universe and avoiding the DC/Marvel rivalry/hang-up some people have if they're REALLY huge fans). 

As for when? Technology is earth standard for civilians, but the military has tech much further ahead. Sorta like what it's like in both the Marvel and DC universes.

[@Wisp]