I would be SO worried. My son is almost six and I'm checking on him constantly to make sure he's still around.
When I was 7-8 years old, I wanted to run away from home. More for an adventure than anything else! Back in the early 90s no-one cared about kids roaming the neighbourhood and a friend and I would walk around and map out a plan. We would go to this street! Eat food from that neighbour's garden! Live in that tree! LOL.
I hope he doesn't turn wild and want to run away from home when he's 7-8 too. I would seriously have a panic attack. (Same goes for when he's 13!!!!!)