"First, realize their worth. They have longevity and history, and well remember what may or may not have aroused controversy in the past. Certainly, times change, but it is always helpful to be apprised of any context that would help smooth the way for current ideas.
Second, meet and greet them on their own turf. Make presentations or even hold a community meeting at retirement facilities or senior centers. They usually have ample meeting space and welcome visitors."