A retired doctor reached the summit of Mount Kilimanjaro on his 90th birthday. Dr. Art Ulene only started exercising at 50, but that didn't stop him from reaching new heights later in life. He shares the three longevity rules he lives by after completing his third successful climb to Africa's highest peak. Head to the link in our bio for more on Ulene's longevity tips. #kilimanjaro #longevity #wellness #health #superagers