While things like nutrition and exercise influence whether people age prematurely or late, genetics also play a significant role. I have a good genetic heritage. There's almost a generation gap between me and some of my peers. I've been exercising regularly since childhood. I've been particularly mindful of what I eat for the last 10-15 years. I don't drink alcohol or smoke. When we look at people who age quickly, we see a higher prevalence of alcohol and cigarette use.