I played the two day trial of TS4 and was wondering how exactly aging works. Auto Age (Unplayed Sims) – Tick – Enables unplayed Sims to age over time. If disabled your Sims will not age up. Does this ...
This link will take you over to Carl's Sim Guide, and he goes into detail on how aging works in Sims 4. It should answer all your questions. http://www.carls-sims-4-guide.com/tutorials/sims.php