Probably an aspect of people using apps while in college, and ending up in that bucket instead. A graph of "age when met" for current couples would be interest

Probably an aspect of people using apps while in college, and ending up in that bucket instead. A graph of "age when met" for current couples would be interesting, if today's "final" couples meet at a later age than in the past because people don't want to settle down as early, you'll have less school couples. We also need a graph of "number of relationships still around started by year" - if fewer relationships started in 2018 are still extant compared to ones in 2014, that's gonna skew numbers too.