Story progression

Story Progression is an option in The Sims 3. It helps keep a town alive and balanced. With Story Progression uncontrolled Sims' lives progress normally. Neighbors may move away, new ones will move in, get promotions, have children, and even die.

Effects

 * Sims grow older with the player's Sims, letting them keep childhood friendships
 * Sims will sometimes have babies
 * Sims in any inactive/uncontrolled households can be deleted
 * Sims in inactive/uncontrolled households can switch jobs
 * Uncontrolled Sims do not complete wishes