This would be because you have Inteenimater in your game. Teens on residential property at Uni will not age to YA in order to allow Uni families. Using the telephone to move to college or moving into a dorm first will keep everything straight.
Strange?, yes I have the new version of 'InTeenimater' in one of my other game folders - but not this one!, this is a new 'Factory Default' folder created by the re-installation of Seasons... :O
But thanks for the tip, I'll double-check this new folder and make sure that none of the new Sims I've imported have the body-clock in their inventories.
Cheers!.
