I also look far younger than my age. I will be 23 this September and I look far less than that. I don't consider this as a problem. Those who see this to be a problem or shortcoming to me, they themselves have a problem in judgment. If they wanna judge me by what I look like than who I am, I am rather happy that I am not recognized by them. Both my parents look younger than their age but people say my father is handsome and my mom is beautiful. Nobody has ever called me ugly. I love the way God created, fashioned, and proportioned me. I am happy with the every method he applied to create me. Sometimes I am sad but at others I realize I am a beautiful creation of Him. I thank Him for the every way He designed me. He designed me exactly as He wished. Nothing more and more importantly nothing less.
Don't care what they tell you about your face. Just listen to your heart my friend.
My post doesn't come with a prescription but it comes with something called honesty.
Sorry for the boring philosophical ideas!