DN was round hanging out with DS and realised he had left something at his house ( in the next village). I said I would run him round and he could get it but he said his mum wasn't in and "doesn't let him have a key" .
He's a sensible mature 15 year old, volunteers and is well behaved and helpful. I just assumed most children had a key long before 15? DS has had one since before he started secondary, albeit at first it was partly to practice using one.