I was a latch key kid. I'd come home alone and mom would leave the house key under the front doormat. I'd let myself in, then I'd call mom at work and tell her I was home and then watch tv and wait for my parents to come home from work. I was also 7 years old. I think today my folks would be thrown in jail if they did that, but the thing is I liked it. I really did. It was never a hardship for me. That's just the way it was.
I don't know of many 7-year-old's who could be trusted like that.