What are the causes of a young person to look old?

While looks are always partially determined by genes, here are some factors for premature aging. Lack of sleep. Too much sun. Poor nutrition - too much sugar, not enough protein and vitamins. Stress and Depression. Smoking, drinking, and drugs. Of course, poor choice of clothing and makeup, bad posture, sickness, and frowning all the time will also make someone look quite a bit older!