Wow, didn't know they were still going at it as late as 1979.
My mom has this really sad anecdote, she went to see them in some small Dublin club, which was like, in the basement of a house or something, I believe in the mid to late sixties. When he got on stage his first words were "good evening, I'm the man that used to be Bill Haley"
That breaks my heart a little every time I think about it