you're correct, my eyesight gets worse as the day goes on and i saw the second "9" as an 8. that only partially reduces the impact from my claim of X, Millennial, Zoomer; as i am gen X and i was still in "middle school" when the food pyramid came out, and my millennial sister assuredly was. the older Gen X (from the early 1970s) may or may not remember (as in an only child and childless until after the poster was no longer used) this from their younger years in classrooms.

My main point was (i think!) that really the only people seeing these posters on a regular basis are schoolchildren. I think i've seen the pyramid a dozen times in the last 20 years, on cereal boxes or websites or whatever, but if you don't recognize it, it's easily written off. Maslow also had a pyramid, etc.