Never. Make-up is for older women who feel ashamed in their own bodies, so they have to hide what they have underneath, in order to feel beautiful. Not to be mean or anything, but it's true. Natural beauty is the most beautiful thing anyone could have. Yes, make-up does make you look pretty, but it does ruin your face when you get older, and trust me... you do not want that to happen.
Everyone is beautiful the way they are. No one needs to hide their own natural beauty in order to feel extremely beautiful.
Real men, will accept you for who you are or what you look like, but many men like natural beauty. I should know... I'm friends with a lot of them.
Whenever you're ready. Don't listen to other people, it's your face, you can do what you want with it. I started wearing mascara at 13, and it's still the only makeup I wear, but that's just me. In my opinion, mascara is the only makeup I think is nessicery, if you're going to wear makeup at all. Just be yourself, makeup is a form of art, so there isn't anything you could do 'wrong'.
If you feel like you want to wear makeup then go right ahead. =] makeup is not evil or anything it's just makeup. What people are trying to say is that you should feel comfortable in your own skin. And a lot of guys who say they like girls without makeup don't realize that those girls do have a bit of makeup. So less is more in the sense of wearing makeup. Girls with too much look bad but girls who only have a tad looks good.