Wtf. As a 41yr old I'm now in the same bracket as a 70yr old?
💩
Anyway. A good book. As in: a hardcover. And from an author the old man already has shown interest in. Maybe even a book the old man has discussed and mentioned "wanting to read again".
Basically a hard cover of LOTR.
Or LEGO.
And if they're into outdoorsy "work" style stuff like hobby forestry, get the old man professional quality safety gear (jacket, fitted safety glasses etc).
Old man. Ffs.