It really depends on each individual child. My #3 son is 10 and has been staying home with his older brothers for a LONG time now. Hhe is perfectly comfortable being home alone for 1-2 hours, even more if I would let him.
I always have my cell phone and he knows the number. He is smart, responsible, and rarely gets the chance to enjoy a quiet house....(we have 4 kids and I run a daycare)....but, you just need to be sure that he understands house rules, like don't answer the door, phone, use the oven, etc.
at 6:34 PM on Sep. 24, 2009