My grandfather, who died when I was 21, was raised by an old aunt who was born in 1872. Possibly, when she was a kid, she met, or was in the same room as, someone born in the 1790s. She was born two years after Dickens died, and 57 years after the battle of Waterloo.
I once read a newspaper article in which the journalist said that his first assignment, as a young reporter, was to interview a lady who’d just turned 100. This was in the 1950s. That lady told him she could remember her grandfather telling her about fighting in Spain during the Napoleonic wars.