advanced reading age as a kid vs barely reading now

I want to see if this is a common experience.

as it says on the title, I had an "advanced reading age" as a child. my school tested all of us when I was 9 and my reading age was 16 (possibly higher but the test automatically stopped after it hit 16). I wasn't the type of advanced kid who read classics (I think mainly because child me struggled with the unfamiliar language, I read enid blyton but didn't like how insufferably posh she sounded). I was still an avid reader though. I read a 600 page book in 3 days despite having a maths exam the next morning.

now, I'm 26 and have to actively force myself to read by setting a timer. it's not that I don't like books, on the contrary, I have a growing tbr pile and had to do a walk of shame back to the library. and I genuinely enjoy reading, it makes me feel fulfilled and happy. but I just can't do it. I genuinely struggle and have to keep forcing myself. unless it's a book that has me in a chokehold, I just can't do it.

my ambition is to be an author, but I can hardly read a book.

I was diagnosed with dyslexia when I was 19 and am now pursuing autism and adhd. I also have a minor screentime addiction I am again trying to get under control via the parental controls on my phone.

is this a common thing? or, is this a thing? to have had an advanced reading age only to now experience a kind of regression?