The really interesting part of the study is where they say long COVID looks an awful lot like a regular reaction to viral infection (I.e. there is still some question as to wether or not it’s actually real).Did you read the study or did you just see what someone else claimed it said (because the study clearly states the average age is around 40)?
The study that shows long COVID is mostly found in the old and the sick is found here;
Long COVID questions and answers
COVID-19 can have lasting symptoms that affect many parts of the body. Learn more about the symptoms and effects of long COVID.
www.mayoclinic.org