The great irony of the ironic "OK boomer" trope being enthusiastically used by millennials is that they themselves are the older generation to which the term increasingly applies.

The millennial generation — generally defined as those born in the 1980s and the first half of the 1990s — is approaching middle age. In less than two months, the oldest of this group will turn 40. The generation so recently depicted as rebellious youth intent on reshaping American culture will become eligible for protection under the Age Discrimination in Employment Act. The youngest millennials will be 23, meaning that college campuses will be almost entirely ceded to the next population cohort, Generation Z.

But millennials, whose numbers surpass those of the baby boom, don't have many of the trappings of a generation approaching middle age. As economist Gray Kimbrough has documented, a large number of people in their 20s and early 30s live with their parents, while correspondingly fewer own their own homes. They're also significantly less likely to be married than past generations.