My 86 year old Aunt is of the same ilk. Doesn't drive now, but after two knee operations she walks down to the village for her groceries, has them delivered, then takes the bus back up the hill, and she takes the country bus into Aberdeen every week for the Recitals in the Music Hall.
She still does her own garden too, and has time to knit and sew for Cancer Link in Aberdeen. She is amazing, just like your FIL.
