What drives an extreme athlete? Find out from Ellyn Brown, a 54-year-old Alaskan who is the U.S. mountain running champ and one of the best snow shoe racers alive.

For a man who has run over 100 marathons at least 100 miles long each and climbed to the top of all the seven summits of the world, it's hard to believe Marshall Ulrich was a bit of a coach potatoes until he was almost 30.

Lou Whitney flies over hills at high speeds, takes sharp turns on dirt tracks and he competes in Motocross championships, all at the age of 72.

A few short months after battling thyroid cancer, Marc Jarkow grabbed his bicyle and took off for Paris to compete in a 750-mile race.

Hollywood legend Paul Newman passed away Friday after a battle with cancer. He was 83. Newman died in the farmhouse in Westport, Conn., where he lived with his wife and occasional costar, Joanne Woodward.

We all kn ow that 41-year-old Dara Torres will be the oldest U.S. Olympic swimmer ever when she hits the water next month in Beijing. But she won't be the oldest member of this year's U.S. team. That honor goes to 58-year-old John Dane.

Many try -- not all succeed. But it seems that these days, the biggest names in mountain climbing are people over the age of 50! In fact, a group of 70-year-olds is hoping to smash the record for climbing Mount Everest.

If you're looking for inspiration to get off the couch – look no further. GrowingBolder.com has the world's greatest collection of interviews with amazing Masters Athletes. But who is the best over-40 athlete of all time?

Older is bolder. Check out our interviews with many of the top masters athletes in the world. These men and women are having the best times of their lives as they turn in the best times of their lives.

Each week, Growing Bolder will ask top leaders, thinkers, writers, life coaches, entertainers and role models to weigh in on issues affecting your life.