That was nearly my great-grandfather. Completely healthy until he was 103. Didn’t need glasses, walked without support, lived alone, completely there mentally and had a fantastic memory. Then he got shingles which affected his throat so eating was painful. He was dead two weeks later. Went from completely healthy to dead practically overnight.
Many people don't realise how evil and terrible shingles can be, thinking "oh it's just itchy skin." No. It is much, much worse than that, and it's very painful as well.