Lifelong exercise can help you maintain speed and fitness as you age | Longevity science | Scoop.it

It’s inevitable: As you get older, you slow down. A 40-year-old runs more slowly than a 20-year-old. A 70-year-old can’t be expected to keep up with a 50-year-old on a bike or a hike. It’s only natural.

Well, no, it’s not.