Older Characters (70+ years)
The Thursday Murder Club by Richard Osman
The Funny Thing about Norman Foreman by
The Switch by
The Windsor Knot by (the Queen herself if the older character)
The Invisible Life of Addie LaRue by - ok, this last one is a bit of a cheat because Addie doesn't age but she imparts all the wisdom of a person who's lived a long time.