My son is 11 years old, other than say get use to it some kids are like that. If my 11 year old goes to bed before 11 at night, he is up by or earlier. I was always like that, I was up half the night. What my doctor did was tell my mom to put a tv in my room to at least keep me their. I grew up watching tv until the channels no longer broadcast, I know al the old actor's have watched the old movies and so on....I know not the best answer, but it at least kept me in my room, most of the time. With my kids I tell them to go play in their room, maybe put a baby gate up at his door so you can hear if he needs you, but he won't be walking the floors.
Some people are just early risers, and they get up at the same time no matter what.