Some of the posters who have said they wouldn’t leave their kids alone til 14-16, can I ask why? when exactly do you plan on helping them learn the skills they’ll need to navigate the world?
My middle son is 14, 15 in Jan. He has suspected autism and ADHD (although the getting diagnosed situation is a while other thread) and as such he struggles with friendships. He’s been going alone into town to meet one, sometimes two, friends at a local cafe that they discovered themselves as one they loved the milkshakes at from 11. I’d have had no issue with him going by himself to go get a milkshake and sit there whilst he drank it at the same age.
My youngest son is 10, in year 6 and will turn 11 this (calendar) year. At the minute, I don’t let him go into town alone, but he is allowed to go and meet friends at a park 5 minutes away, nip to the local Co-op/corner shop on his own if he wants to go get some sweets or something. If he were to ask me if he could go to a cafe in town with friends, I would let him as long as they’ll stay together.
But we do live in a very small town - if we lived in a bigger/busier town or a city, I’d wait til secondary school age I think. Even now, I won’t be encouraging it til then. For me, some of the best times of secondary school were going into town with my mates after school!
As for leaving at home, my youngest is allowed to stay home with his older brothers for 15 minutes or so in the day, potentially up to an hour in an emergency. If his older brothers weren’t here, I’d trust him by himself if he were playing a game or something for you to half an hour max (longer than with his brothers because he and the middle brother sometimes get into big fights). I will add though, that his best friend lives 2 houses away and both me and his mum have said to each other that the others children are more than welcome to come round at any time if they need anything or are scared etc.