Birthday

Birthdays occur when Sims go to their next stage of life, which can be one of the following:


 * Baby > Toddler
 * Toddler > Child
 * Child > Teen
 * Teen > Young Adult (requires University)
 * Young Adult > Adult (requires University)
 * Teen > Adult (Note: This occurs when a Teen doesn't go off to a University Neighborhood)
 * Adult > Elder
 * Elder > Death

Whenever a Sim is two days away from the next age transition, a warning will pop up in the top right corner alerting you that you only have two days to either get your aspiration score up (if your Sim is in the negative), or you'll see one stating that you have nothing to worry about since your Sim's aspiration is already high. Twenty-four hours after that warning, you will get another alert telling you that your Sim can age. You can either buy a birthday cake in Buy Mode or you can just directly click on the Sim (as long as they are not babies) and choose grow up. In order for a baby to grow up, your Sim must take the baby to a cake or wait until they (autonomously) get the interaction to "Help Grow Up" eventually. Sims also grow up well or grow up badly deepending on their aspiration score at the time of transitioning. You should wait until your Sim is out of the red before aging your Sims.