Sixty used to be old .

Today’s seniors have a much different view of fitness than their parents.

Now baby boomers can look to Goldie Hawn, Diane Sawyer and Harrison Ford for inspiration as they near retirement age.

Senior citizens are having a moment. The U.S. population is getting older — average life expectancy has passed 80 years for women and 75 years for men, and it’s expected to keep rising, thanks to advances in medicine, nutrition, and safety. In fact, about one in seven adults today is older than 80, and the fastest-growing age group is people over 100.

But many of today’s seniors aren’t content to sit still and age quietly. Lately, we’ve seen headlines of amazing elders who have completed marathons, graduated college, raced in NASCAR, and more.

“No matter how old you are, it’s never too late to start living a healthier, more active, more engaging lifestyle,”