How can i look more my age?

I totally understand Im 22 and I look about 14/15 because of my height and weight (5'2 and 100lbs)...what I usually do is wear wedged hills for height and try to accessorize to look more my age...extensions and make up could make u look a tad older but if your small with a baby face then its really not much you can do but enjoy the looks while you still can :)