As the Baby Boom generation enters retirement age, patterns of living among older persons are beginning to change.1 Unlike their predecessors, the Baby Boomers lived through the sexual revolution, divorced more easily and more often, and institutionalized new patterns of coupling, such as cohabitation. As a result, the rate of marriage has declined and the percent of the population classified as “single” has gone up.2 This age cohort has now moved into the sixty-five-plus group and makes up those we think of as the retirement generation, or the “Third Age” group.3
https://www.americanbar.org/groups/family_law/publications/family-law-quarterly/volume-52/issue-1/living-apart-together-family-form-among-persons-retirement-age