Somebody please remind me why it's somehow acceptable for a grown adult to enter a sexual relationship with a preteen.
Because in anime, 10 years old is considered "adult", and at that age, they are free to roam the world, collecting godlike beings of ludicrous power (if we believe the pokedex isn't lying, anyway,) so that they can fight international crime syndicates.
That's also why an 18-year-old can be a 'veteran' who has already retired from a harrowing career in the military.