Books with an elderly protagonist are typically great! I read a few on the list, and would like to read a few other ones. But here is a list of books with older protagonists and characters.
The Switch by by Beth O-Leary
A Man Called Ove by Fredrik Backman
News of the World by Paulette Jiles
The Lido by Libby Page
Three Things About Elsie by Joanna Cannon
Made for Love by Alissa Nutting
The 100 Year Old Man Who Climbed Out the Window and Disappeared by Jonas Jonasson
The Little Old Lady Who Broke All the Rules by Catharina Ingelman-Sundberg
The Unlikely Pilgrimage of Harold Fry by Rachel Joyce
Millard Salter’s Last Day by Jacob M. Appel
The Curious Charms of Arthur Pepper by Pheadra Patrick
Fried Green Tomatoes at the Whistle Stop Café by Fannie Flagg
Britt-Marie Was Here by Fredrick Backman
One in a Million Boy by Monica Wood
The Housekeeper and the Professor by Yoko Ogawa
Lillian Boxfish Takes a Walk by Kathleen Rooney
Dendera by Yuya Sato
Augusttown by Kei Miller
An Elderly Lady is Up to No Good Stories by Helene Tursten
The Old Man and the Sea by Ernest Hemingway
Our Souls at Night by Kent Haruf
My Grandmother Asked Me to Tell You She’s Sorry by Fredrik Backman
Water for Elephants by Sara Gruen
Driving Miss Daisy by Alfred Uhry
Olive Kitteridge by Elizabeth Strout
Olive, Again by Elizabeth Strout
The Giver by Lois Lowry
How the Penguins Saved Veronica by Hazel Prior
The Love Story of Missy Carmichael by Beth Morrey
The Notebook by Nicolas Sparks
Miss Jane Marple books by Agatha Christie