I saw some of my cousins recently at a BBQ. When we were all kids my parents witnessed to them and their parents. Telling them of 1975 and the generation that will not pass away and how we would never grow old. Now a lot of my aunts/uncles are dead and our grandparents are gone. As I was leaving one them asked about our lives as witnesses.
I'm sure had I told them about the overlapping generation I would have got a big laugh.