New data shows that having certain health conditions as a teenager causes you to age faster as an adult. In the study, published last week in the journal JAMA Pediatrics, researchers tracked the health and behavior of over 900 people from age 3 to 45. They found that three conditions as an adolescent were associated with faster aging – smoking, obesity and psychological disorders. Participants who had two or more of these three health concerns walked more slowly, had a brain age over 2.5 years older, and a facial age over 4 years older than those who didn’t have those health concerns growing up. By identifying these health risks at an early age, doctors might be able to slow the aging process and improve patients’ health later in life.