Icm506d2. Professional athletes typically reach peak performance in their mid- to late-20s, some into their 30s. Most are retired by the time they’re 40. 3. As for everybody else, most, people give up competitive sports after high school or college. 4. Some are content to just watch from the sidelines. 20. This is a book about their inspiring journey – their physical struggles and amazing accomplishments. 21. Some of these older athletes have always been active, while others waited until later in life. Each has a story to tell. 22. By staying active and competing in sports, they are keeping their bodies firm and fit, their minds sharp and lucid. 24. All are waging a quiet revolution. 25. And many more are expected to join in, as baby boomers – 76 million strong – challenge the concept of aging. 29. Photo credits: nytimes.com Rick Rickman Bodybuildingtoday.com World Triathlon Corp. Fitterforlife.com New York Road Runners 123RF Stock Photos Penn State University Creative Commons Ron Baers via secondact.com Joyce Pines via today.com Honolulu Marathon