My iq has actually gone from 150 to 122 in the last 13 years. But I'm pretty sure it's due to sleep apnea related oxygen deprivation. I can still fucking read though.
I mean i definitely don't read anywhere near as fast or retain it as well as i did in my teens. And i also have WAY less focus now a days. Sitting and reading a book used to be easy but now it's a chore. Media brainrot is definitely real