Although the Tokyo Games will mark his seventh time participating in the Olympics, equestrian Phillip Dutton, the oldest athlete on Team USA, says competing in 2021 is no less of a thrill than it was the first time 25 years ago. "It's very unique and special to have our whole country cheering for us,” the 57-year-old tells AARP. America's oldest athlete was actually born in Australia and grew up with horses on his family's sheep and wheat farm. He spent most of his upbringing competing at pony rallies and horse trials. Then, in 1991, he moved to the U.S. to train. Five years later, at the age of 32, he participated in his first Olympics.