My teen aged up while he was in an enraged mood. He sat down and had something to eat, still enraged. He was still considered a child as his mum could still parent him. He got up and I got a message...
I believe there is a cheat that can be used to change out the mood prior to aging them up. From the sounds of it you manually aged him up, am I right? Sometimes, the phases don't go away as they should. @rosemow