People are mature at different ages, so it depends on the kid.
I was never left home alone until I was 12...but I guess it depends on the kid
Depends. If it's just for a few hours then 13. If it's over night then about 15-16
I stayed home alone over-night when I was 13, but I was always more mature than other kids my age. I suppose most kids at 13 wouldn't be responsible enough.