"The Zimmers are a British band, and thought to be the oldest in the world: the lead singer, Alf, is 90, and the oldest member, Buster, is 100.
"The band was created as a feature in a BBC TV documentary, which was first broadcast on 28 May 2007) to give a voice to the feelings of isolation and imprisonment suffered by the elderly, in which the band recorded a single." - from bio
First, if you haven't seen or heard them yet:
Then, Tuesday, June 5th, they are performing on The Tonight Show.