What is the secret to a longer life?

Well, we know the fountain of youth is probably not going to work. You could always eat an apple a day, or even exercise regularly. Most of us believe we’re in control of how long and well we live based on the choices we make. And that’s still true — but new research suggests that your genes have a significant impact.

Experts say 55% of your lifespan is already determined by your genes, which is consistent with what we know about other species.

Think about it: Traits like cholesterol levels and osteoporosis risk are shaped by our DNA and how it tells our cells to function. And, as much as we know about biology, there’s plenty we don’t — and some unknown elements interact to determine our life expectancy.

Life choices and luck play a role. The U.S. Centers for Disease Control and Prevention reports that life expectancy in the United States reached a record high of 79 years old in 2024, and studies say how you approach exercise, diet and social connection will influence your age by about five years. This means if the life expectancy established by your genes is 85 years old, you could live anywhere from 80 to 90 years depending on individual decision-making.

Genetic screening for conditions like bipolar disorder and kidney disease will reveal inherited risks, but no test will tell you how long you’ll live. In some cases, looking to your family’s longevity might give you some of an idea.

But even if your parents and grandparents have passed down the winning numbers to the genetic lottery, don’t rip up your ticket with smoking, excessive alcohol and unhealthy eating habits. You could still risk shaving years off your life.