I was lucky enough to see Ken Dodd a few years before he died. He played the Regent's Park Open Air Theatre in 2012, came on around 7pm and sure enough finished around midnight. He was well into his eighties by then but on fine form, even if he was doing gags he'd probably been doing for years: "Smokeless fuel factory burnt down - no one noticed". At one point someone brought on a flask and sandwiches and Dodd asked the audience if they had brought theirs.