Rounder cheeks, and chin, oval, round, or heart-shaped face, larger eyes, and a button nose all contribute to a more youthful appearance. Forget the real world; we're talking virtual people here, and such things must be somewhat exaggerated to push the effect across. Even then, the actual shape-shifting (morph-target blending) should be subtle so as not to "look" exaggerated. The heart-shaped face and wide forehead in this model both contribute to the teen look. In just a few minutes here check out my "Kid Stuff" post... The overall ingredients of a youthful face are quantifiable, the tricky thing to do is to achieve that subtleness. Nice job with this model! Thorne =};-}>