Keene’s son Ben said his father had spent much of the pandemic training at home with the help of a personal trainer.
He added that his father would “go out for long walks with weighted backpacks on Dartmoor, Exmoor and the South West Coast Path where he is a trustee of the organisation”.
“When he was able to travel, Graham went to the Alps to train in ice climbing with his German guide Luis Stizinger, who has been with him every step of the way for the past several years,” Ben Keene wrote on his blog.
Mr. Keene is now one of the 20 oldest successful climbers of Everest, according to the Himalayan database of those who have attempted the trek.
It was born in 1954, a year after Sir Edmund Hillary and Tenzing Norgay achieved the first successful climb of Everest.
Mr. Keene started his climb in the early hours of each day to avoid exposure to the sun and the throngs of other climbers trying to reach the top.