Makeup hides the real you. Instead of hiding, accentuate your features! Try a light coat of black mascara and an ivory shade of eye shadow applied lightly under your brows (this make your eyes look awake and open). For your face try a pressed powder applied lightly to even the skin tone. For lips try a tinted gloss or even chapstick or blistex. This look is the "natural" look they have in all the magazines. Keep in mind that the people you see in them have been photoshopped to remove things like freckles, moles, etc...the men and women.
As for age, I started experimenting when I was 16. Boys don't give a crap either way, they aren't interested in your face or anything you have to say at that age anyways. Be beautiful for yourself and encourage a healthy lifestyle from within because a healthy inner life will shine through and people will notice you for that. True beauty comes from within! Good Fortune to you!
im 14 And i Wear Makeup ( Eyeliner Liquid EyeLiner , Lip Gloss , Mascaraa) but then again i do it because idont want people to be sayin i look ugly , so if ididnt look bad without makeup iwouldnt be wearing it .