Two 50-plus year old climbers completed a six-mile-long ridge on Nanga Parbat this last summer. Which "... is the longest ridge on any mountain over 8,000 meters and traverses the summits of eight peaks over 7,000-meters."
In order to finish the climb, the two slept two nights in a snow cave above 7,000 meters and went without food and water for 3 days. Quite a story. Summary of the climb here. Their blog report here.