Preteens can be aged from toddlers once you have completed the Preparing for Preteens Quest. You will then be able to bake a birthday cake on a stove which takes a day and costs 5LPs. Once the birthday cake is made click on it and then you can click on your toddler and select the option to have birthday, they will then age into a preteen.
There is a selection of hobbies Preteens can do. This includes: Ballet, Karate, Diving, Figure skating, Seashell Collecting and Skill Tester.