Japanese climber Yuichiro Miura, 80, reached the top of Mount Everest [on May 23], becoming the oldest man to scale the world's highest mountain. The climb marks the third time Miura has summited Everest, a successful feat in itself, but even more remarkable considering his age and his medical history. Discussing the hurdles of climbing at such an old age, the octogenarian said, it was to challenge his ultimate limit." "It is to honor the great Mother Nature," he said on a statement posted on his website. "Hoping to raise even an inch of human possibility." Miura didn't attempt his first climb to the top of Everest until 2003, when he was 70 years old. He made that trek with his son, a former Olympian, and set a world record as the oldest climber to successfully scale the mountain. Five years later, he returned again -- at 75 years old -- to set another record. Yuichiro Miura has spent a lifetime defying the odds. In his younger years, he skied down Mount Everest's South Col, an adventure that was documented in the 1975 Academy Award winning documentary, "The Man Who Skied Down Everest." Not satisfied, Miura summited and skied down all seven summits of the world, by his 50s. Miura has already discussed his next venture -- skiing down the Himalayan mountain of Cho Oyu, the sixth highest mountain in the world. He hopes to take on that challenge five years from now when he is 85 years old.