University sims won"t age in neighbourhood

I made one of the University Sims move in with my sim who had been at university.
But now it"s been a couple of days and my sim has aged and everyone in the family has aged but the University sim (Jeffery Dean, fairy) has not aged.
It still says he has 100 days left until aging up but it was just like that when he moved in.

I have no downloaded custom content btw.

This is not a glitch nor a problem. Sims never age up during their study in The Sims University. The only thing that will change constantly is the time (like semester period) in the town.

Therefore, when your sims were teleported back to its home neighbourhood, the age is still the same.