no, i don't think so...for the sims 2 there was this object you could download and make your sims young again but i don't think anything like that has been made for The Sims 3.yet.
Chat with our AI personalities
young adult, i think.
No, in the sims 3 only young adults and adults can become pregnant and have babies.
All sims in sims 3 can become cheerleaders in the university life. Sims 3 is just like real life, cheerleaders are not made but discovered within certain people.
If you mean on Sims 2 then you have to have the University expansion pack, then make a teen Sim go to college and they will turn into a young adult Sim. If it's on Sims 3, then I am not sure, sorry.
Teenage sims will graduate from school once they become adults.