There is no magical age to start wearing makeup! When you feel like giving it a shot, go for it; but don't feel pressure to start wearing makeup if you don't really want to. If you decide to wear some, just remember to keep it natural at first. Enhance the beauty that you already have. A little lip gloss and some blush can go a long way! You can start experimenting with colors for a special event, or just get a group of friends together and try stuff on and ask what they think!
Hope this helps you!