This is sad. I assume it’s covid and trauma since the data they started with was in 2013 and the rise began in 2016 (it’s not all from covid but 2016-2020 was traumatic for people who care about people and the planet.)
Sharp rise in memory and thinking problems among U.S. adults, study finds https://medicalxpress.com/news/2025-09-sharp-memory-problems-adults.html