The friends(or their parents) he has are on the spectrum, bipolar or ADHD. Other friendships tended to fizzle out when he goes to sleep overs. I wouldn't be surprised if he already knew about it. About two months ago he looked at me and said "Why don't you want me to know I have bipolar like you and dad?" and he always surprises us like that. I'm thinking mid-late teens as things seem to be getting harder for him as he gets older. I don't think we have a hand-in-hand relationship more then any 11 yr old.