1.I think that they should be encouraged to follow their dream because that's what they like to do.They should be helped and encouraged every time.
2.The problems of being famous when they are still young are that they can be hated by some people for silly things,or they are discouraged.
3.I don't think there should be a minimum age for children to become famous.Just because they are children doesn't mean that they can't become famus.