Must be so weird to be playing at that age with teammates twice your age or over. I know he's used to playing alongside older youth players for a while but even still he appears to be handling everything well.
I'm sure everyone tries to be accommodating, but I'm thinking of dressing humour etc. For a start there'll be cultural references that he might not get, and if he tried to crack jokes relevant to his age group there could be a load of blank stares.
Then there's speaking up and offering encouragement or guidance to teammates. Playing with guys your own age anyone on the team can do it. The idea of doing things like that would indimidate the hell out of me and I'd be quiet as a mouse on and off the pitch. Maybe he's quiet too, but I think it would affect my game, feeling out of place and uncomfortable. Hats off to him that it's not like that for him.