Oldest American climber to summit Mount Everest, Arthur Muir, 75, gestures from a vehicle as he arrives at an airport in Kathmandu on May 30, 2021. (Photo by PRAKASH MATHEMA / AFP) (Photo by PRAKASH MATHEMA/AFP via Getty Images) KATHMANDU, Nepal (AP) - A retired attorney from Chicago who became the oldest American to scale Mount Everest, and a Hong Kong teacher who is now the fastest female climber of the world's highest peak, on Sunday returned safely from the mountain where climbing teams have struggled with bad weather and a coronavirus outbreak.Arthur Muir, 75, scaled the peak earlier this month, beating the record set by another American, Bill Burke, at age 67.Tsang Yin-hung, 45, of Hong Kong scaled the summit from the base camp in 25.