Put a flyer at your local contra dance. There's a high lilihood of finding like-minded folks there, though I don't know what the age distribution is like in your area...

You might not want to exclude the idea of playing with folks not of your generation; might provide some learning opportunities. ;-)

Come summertime, go to the Old Songs Festival, outside Albany. There seemed to be a good assortment of folks of various ages there.

~ Becky in Tucson