Brent Weigner's passion for pushing his body's limits in ultra-marathons has taken him to every continent on the planet, including a race at the North Pole.

81-year-old Robert Gralley has completed more than 40 marathons and is not slowing down any time soon.

Ready, set, run! Growing Bolder takes you to the only place in the world where you'll find so many colorful characters, both in and out of costume, to find out why these days, many marathons are dominated by people in their 40s, 50s and beyond.

Known as the "Nun on the Run," Sister Madonna Buder has finished about 40 marathons and 34 Ironman triathlons and two years ago, at the age of 75, she became the oldest woman to finish the Ironman World Championships.

Jeanne Stawiecki is living proof that it's never too late to dramatically change your life -- even in middle age.

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.

Ray Zahab used to be a smoker who lived an unhealthy life. After a few major life changes, he's on the other side of the spectrum, running marathons, raising awareness for important causes and living an adventurous life.

We're looking into our past to show you the way forward. Some of our favorite guests of 2008 from the GB Radio Show will inspire you to start 2009 off on the right foot.

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.