"Collage-age" is anything from toddler on up (basically, anybody with enough dexterity to glue macaroni to construction paper).

College-age, which is what I meant before I made that embarrassing typo 🤦, is generally 18 and up except for people in joint enrollment or who graduated high school early (which I would say implies that they're high-achieving enough that their literacy shouldn't be in question).

How is it "a stretch by any measure" to say that people who are at least 18 now, and who therefore were at least 15 when ChatGPT came out three years ago, should've already had a better than 10-year-old reading level by that age and would therefore have had to have regressed in order to have a 10-year-old reading level now?

You're the one who interacted with college level students. Shouldn't you know what's the average college students' age? This feels like you're moving the goal posts.

EDIT : I misunderstood their comment.