Your dad is a stud, tell him happy birthday for us all. I had a neighbor when I was young that cleaned seed, witched water, and even dug the wells- all with one polio arm. It might have slowed him down a little but it never stopped him. He'd do as much work in a day as any man!
Remembered when Rally's dad turned 80 at one of the conventions. Happened to be there when the Ice Cream cake was served and the 95 *F temp it did not last long. Almost felt like family when being served. 80 birthdays when your doing what you like is awsume.