Enter Player Interaction with the older player, click on Development (I think) then there's Tutoring. I think its development... there aren't many anyway. Then a list of younger players in the same position will come up and you can ask them both if they're up for it
Go to the play you want him to be the teacher then right click on him, click player interaction. In the chat box, go to development then tutoring, then choose who you want him to tutor.