Top ten books about old men

One of ten top books about old men, as shared by Ross King at the Guardian:
The Old Man and the Sea by Ernest Hemingway (1952)

“Everything about him was old except his eyes and they were the same colour as the sea and were cheerful and undefeated.” How can we not cheer on Santiago, the luckless fisherman, 84 days without a catch, who on day 85 hooks the huge marlin far off the coast of Cuba?