Clicking the "Create a Sim" icon will generate a random adult Sim, who may be male or female which can be edited by the player.As opposed to The Sims, any age besides baby or young adult (which must be made in the University Create a Student) may be created.
Pregnancy, toddlers, teens, and elders are new stages of life.
Young adult is a unique age added with the University expansion.
A Sim will be born when a female Sim and a male Sim try for a baby.
The mother will spend 3 Sim days (each day lasts 24 minutes though time can be sped-up) pregnant before giving birth to a baby. The baby's appearance and personality will be based on the genetics of its parents (though the baby's appearance is hidden until it becomes a toddler).
After 8 days, the child grows into a teenager, and will live 15 days before changing into an adult. An elder will eventually die; the length of this final stage depends on the aspiration bar when they become an elder.
Babies, toddlers, children, teens, and adults can be advanced to their next life stage at any time during the 24 Sim hours before they will grow up automatically. Toddlers, children, teens, and adults can use the "Grow Up" self-interaction.Instead of having to choose from already finished faces which include hair, it is now possible to alter the facial structure (e.g.widening the nose, thinning the lips, elongating the chin, etc.) and choose any hairstyle to go with it.Some expansion packs have new mini-games, like running a Greek house in University or dating in Nightlife.In Nightlife, each date is a challenge to keep both Sims as happy as possible while accumulating aspiration points.Various other expansion packs introduce supernatural characters which Sims can be turned into, such as Zombies, Vampires, Werewolves, Plantsims, and Witches.