What single factor determines how much longer you have to live?
The obvious one is age. After all, if you’re 80, it’s likely you have less time left than someone who is 60.
Genetics are big factor, too. If your parents and grandparents lived long lives, chances are you will, too.
Whether you smoke makes a big difference as well.
But it turns out that there is another longevity factor that is more powerful than any of these.
Physical activity is the number one predictor of lifespan, a new study shows.