I really don't know. I've spent my entire life trying to figure this stuff out but I've only really had two years outside a place I came to realize was lying to me about a lot of stuff. So it would really depend on why we were getting these powers in the first place.

[It could be anything from genetics to weird vault aliens to idk, magic.]

The powers? That's my current theory if only because I don't think you'd be able to tell that there's only ever six around at once if they were all getting totally new powers.