Depending where I go I can see either Jim's scenario "the oldies still left in the revival have turned to the pop music my dad despised" or Mat's "The majority of the material at said events would be traditional. ". The folk music scene in south east England at least is by no means homogeneous. The split is in proportions similar to Brexit.

One thing that older people working in fairly young teams have commented to me is that younger people are less likely to go to "the club" every week be it any sport or genre of music or just a regular venue for a drink than our generaton were. If you can get somebody over 50 into your club and they like it they will probably come back of their own accord, with a younger audience you have to sell each night to them.