In The Sims 2, it is normally the longest life stage in a Sim's life; in The Sims 3, it is the same length as the young adult stage. In The Sims and The Sims Pet.
Two young adults in The Sims 3. Young adult is an optional life stage introduced in The Sims 2 with the University expansion pack. In The Sims 3 and The Sims.
Because my Sim only grows up into a adult, but while she was a teen she had a boy friend and everything?, The Sims 2 Questions and answers, PC.