Young adults look like adults, but they have teen voices. On close examination, their faces may appear younger. They move slightly slower than elder Sims, and .
It is the only life stage in which a Sim can get pregnant and get a full-time job. Adult Sims that are 5 days or less away from becoming elders cannot get pregnant.
For those not going to uni, you do not want to grow them up with Squinge's cake, that will give them a memory of going to uni. Squinge's cake is.