An 80-year-old Japanese man who has had four heart operations in recent years became the oldest person to climb to the top of Mount Everest on Thursday - although his record may last only a few days.
An 81-year-old Nepalese man, who held the previous record, plans his own ascent next week.
Yuichiro Miura, who also conquered the 29,035-foot (8850-metre) peak when he was 70 and 75, reached the summit at 9:05 a.m. local time, according to a Nepalese mountaineering official and Mr Miura's Tokyo-based support team.
Mr Miura and his son Gota made a phone call from the summit, prompting his daughter Emili to smile broadly and clap her hands in footage shown by Japanese public broadcaster NHK.
"I made it!" Mr Miura said over the phone. "I never imagined I could make it to the top of Mount Everest at age 80. This is the world's best feeling, although I'm totally exhausted. Even at 80, I can still do quite well."