One of the mid-Hudson’s perennial cultural treasures, the Vanaver Caravan troupe of musicians, dancers and educators, is celebrating its 40th anniversary this spring. Considering that I had the pleasure of first meeting Bill Vanaver and Livia Drapkin Vanaver very soon after they settled in Rosendale circa 1975, that milestone makes this author feel very old indeed. But in spite of Bill’s brush with mortality when he needed cardiac surgery in 2006, this dynamic, relentlessly creative couple doesn’t show any signs of contemplating retirement. As usual, they’ve got so many projects on their plates that it’s tough to steal a few minutes for an interview.