Give us the old songs...?

Online fan discourse can be critical of the classic prog bands touring their old material. New music is seen as an essential for a band to stay relevant. Yet crowd response at gigs is nearly always biggest for the old songs, so are fans out of touch with most of the paying audience?

Consider this recent review of a Fleetwood Mac show: "How heartwarming it is when a band of a certain vintage recognises that another new album would be about as welcome as rheumatism and heads out to play everyone’s favourite songs with no ulterior motive."