So I'd have to grit my teeth, wait till my husband came home at 8 and say. Most 12-year-olds are mature enough to be left home alone. I value their independence and think they're capable. Most 12-year-olds are mature enough to be safe when they are ready to stay home alone. Take the kids on a tour of these Chicago spots made famous through popular films like Home Alone, Divergent, Sixteen Candles and.