One of the biggest give-aways for looking old is a curved back, slumpy sitting, and shoulders that ride up too high with respect to your neck. Fix your posture by thinking of the top of your head as a flat surface (hey, maybe it is) and then try to get that flat surface as tall as you can. Consciously push down your shoulders. Do this as you walk and sit. Take a “posture check” as often as you think about it during the day. Young people may not have perfect posture, but correcting your posture will make you look more youthful (Posture tends to worsen as we age).