I read The 100-Year-Old man Who Climbed Out the Window and Disappeared for 90/100 age group but I think it’s on the list. It’s pretty entertaining. If you’ve read that one, there’s a sequel called The Accidental Further Adventures of the Hundred-Year-Old Man.
I read The Book of Charlie by David Von Drehle, which may fit in the category. Charlie White lived to age 109. When he was already well into his 100s the author, a neighbor, had numerous conversations with him about his memories and how he thrived through all the changes that happened during his century of life. The book is more a review of Charlie’s life than about his life in his 100s, so I used it for the Character Aging prompt, but I think it would work for either (or both!). Charlie had a remarkable life and there are lessons for all of us in the book. And, it’s only about 200 pages if you’re looking for something on the shorter side.