I have to admit that I am stunned at the number of people who don't let their 12 & 13 yr olds stay alone! My daughter is 10, and has been allowed to stay alone for up to a couple of hours since last summer. My 8 3/4 yr old son is allowed to stay alone for up to an hour. They are not allowed to stay alone together, because they fight too much, and that would be a recipe for disaster. I checked with family services, and where I live there is NO magic age when children are allowed to be left alone. Each child is different, and you have to judge the maturity level of your own children. They said as long as they understood the safety rules, it was fine. They are not allowed to open the door,or answer the phone ( they know our cell # for caller I.D). They are allowed in fully fenced, locked back yard only. They cannot use scizzors, knives, or anything else sharp or hot while we are out. We call frequently, ( annoys my son, because he just wants to play his video came in peace, and he has to keep answering the phone!)We always have our cell phone, and never go far away.We also have a monitored alarm system. We started leaving them for 10-15mins at a time to let them get comfortable with the idea of being alone. If they weren't comfortable with it, we wouldn't do it, and it is more from a desire to teach them coping skills, independence, and self-confidence than any desire to run out that minute for a bag of milk.
I know many of you are reading this, completely horrified that we are such negligent parents. I think that in this new age society of trying to protect our children from every possibility, that we are also doing them a disservice. We watch over them and monitor their every move, and as a result this generation is noticably more immature, and less able to function responsibly as young adults then we were. I know there are a lot of weirdos out there, and for that reason, my children are not allowed to go to the park by themselves, etc., but safely locked in my own home, fully understanding an obeying all the rules, is a good experience for them.