I’m slightly younger (born in 86) but went through a similar thought process a couple of years back. I remembered being an avid reader as a kid but could barely make it through a book or two a year, and struggled to maintain any form of attention span. I forced myself to read more for about the first month, then I got addicted to it again and ended up reading 42 books that year. I’m very conscious now about pretty much always having my devices in some form of focus mode/app time limits and prioritizing focus/reading time. I feel much better.
SNRIs, getting older, and being much more selective about the fucks I give.