The book "Aging Well" goes into detail about the men themselves, the study perimeters, and the interviews they conducted:

https://www.amazon.com/Aging-Well-Surprising-Guideposts-Deve...

None of these guys led perfect lives. Alcoholism, abuse, death, divorce. But as they grew older the things they most often cited in hours of interviews as objectively making them happier, were the relationships they forged and kept along the way.