There are a lot of VERY good young singers and musicians around , but too many of them are looking for the main chance - Form a band , and look for Art Centre Concerts (Thats due to the attitiude of the colleges where they learn their music , I think) rather than spend time getting established on the Club circuit . And young musicians are more likely to go to local sessions where they can play all night , rather than go to a club and get two songs in an evening , and sit through boring old farts like me !
El G has it right - try for the later twenties upwards , who are more likely to sit and listen !
AND of course, all the people who stopped going to clubs when the children came along ! Are the kids old enough to look after them selves ? Then go back to the folk clubs !!