Yes the crowds are normally 21 (have to be to get in to most of the clubs) up to mid 30' early 40's. What has surprised me is they all seem to have a pretty deep knowledge of folk music. Of course you have some that are just there because they think it's the cool thing to do. You will always have that but there is a big interest. Another thing that I think is really cool is how much they get into it. I saw Bawn in the Mash play down in Buchannan Tennessee a few weeks ago and the crowd was WILD. They were pushing all the tables aside and dancing and jumping and yelling. It is not a real sit down and listen type of event. Bawn is driven by the fiddle and mandolin. The fiddle player will play mandolin too resulting in dueling mandolins.
You can find them on myspace but I have to admit all of them have failed to capture the live energy. I think they are good on the recordings but live OMG high energy very high energy.

Here is a short list if you want to check them out on myspace

Bawn in the Mash: Bluegrass/Folk/Jam band Rock mixture

Bonepony: Bluegrass/Jam band type rock mix. Bonepony's Fiddle player quit and they have restructured the band and sound. I haven't really heard them since this happened. Tramp was an insane live fiddler.

The Legendary Shack Shakers : Punk/Folk/ReligiousThemes/Rockibilly/Blues
These guys are unique. They are the only ones so far to have international success and they have had the highest degree of National success so far out of these bands. The whole band originally were from Paducah Kentucky (same town as Bawn in the Mash, country band Exile, Carl Perkins was from right outside Paducah across the Tn border) but now only the lead singer Col. JD Wilkes is from there. They are more on the rock side. They classify them as southern gothic.
http://www.youtube.com/watch?v=tgphO4JJIrw
That is one of thier videos off of youtube. Col. JD also a filmmaker I think he made that video. He has a new fim out that has won alot of indy awards called Seven Signs. Alot of this documentary was filmed right around here. He is an interesting guy. He has his Masters in performing arts.
Want anymore info let me know