If you want to hear never-been-told stories about your parents and grandparents, you might hit Yankee Clipper on Great Road for a haircut. Sink yourself into the second chair from the left. That’s where Walter Reynolds, a barber since 1962, shears his customers’ hair while listening to them reminisce about serving in wars, cheering for the Bruins and the Red Sox for historical wins, and high-school sweethearts whom they never married.