Well, if you were looking for an official hard-and-fast age, you're out of luck. Michigan does not set a minimum legal age for leaving children at home alone. Get our free mobile appStart with a short trial while you're nearby, maybe at a neighbor's house watching anxiously through the blinds. Remember: Daytime after school is a whole different world than leaving a child alone all evening or overnight. Michigan sets no simple sibling-babysitting age, but the AAP recommends sitters be at least 13 and mature enough to manage common emergencies.