My Great-Grandpa Austin was born in 1888, and died when I was in Kindergarten in 1982. He had hoped to live to 100, there was no medical reason why he shouldn't, but he just didn't wake up one morning. My Great-Grandma died in 1974, and GG Austin lived by himself in their house until his death. Never had to go into a nursing home, just didn't wake up one morning.
I have very fond, but somewhat fuzzy memories of the trips to see him. He was a very nice man, whose only flaw was an unhealthy affinity for Fig Newtons -- I couldn't stand them and he was always trying to get me to eat them. He didn't like it when I whacked people with his cane either.