i think girls should wear heavy make-up as LATE as possible. cause wearing too much make-up will ruin your skin. but the simple stuff like mascara, eye-shadow, and eye-liner, preferably late also. at least 16~18 ish. but dont over do it.
personally, i wouldnt wear make-up until i feel like i have something to hide, besides my pimples. >o< cause once you start wearing it, you'll think you'll look weird without it so youll keep on wearing it. soo i would wear it only for special occasions. :D