Comments of chapter undefined of Why Bother Being a Hero?

Actually how can a 6yrs old sing such songs? Also how come jackman is an actor in that universe? The most possible backstory for him would be dude was a pro hero with quirk similar to wolverine and slowed aging and is now retired using his rest of the time doing movies. Heck I doubt there are any other movies genres. UK to brainwash kids to be heroes.