I say too young. Maybe 10 and 12 would be a good age to really think about it. I worry more about a child coming into a house alone than staying there alone. There has been a run of break-ends in my friends community lately and they have all taken place while everyone is at work and are discovered when the people come in after work or school. How scary would that be for a child to discover and would they know what to do???? Being home alone, would mean staying in the house, doors locked and alarm on. Pretty tough on a 8 year old that wants and needs to go outside and play after being in school all day. I would maybe leave them for a short errand or two when they are already home and you leave and come back within 45 minutes are so. Good luck on finding a solution that works.