In deciding whether your child is ready to try in-line skating, you should consider your child’s:
Physique (foot size and body strength)
Skill (general athletic ability and large-muscle coordination)
Maturity (Ability to look out for surface debris and defects; judgment; attention to traffic).
Most 7- and 8-year olds are probably old enough to in-line skate, but some children may be ready earlier or later.