A 2021 French study indicated similar rates of Long COVID symptoms in children three months after infection regardless of prior COVID status, but higher rates in adults who had COVID previously.

“so for instance I saw a study uh I think it was in 2021 um from France where uh they looked at people who previously had COVID and previously never had CO and in among kids uh and then they were measuring subsequent long COVID rates after after infe at at long CO rates comparing the the match match people who previously never had CO versus who who did and in kids the rates of measured long CO which back in that study I think was like a did you have one of some number of symptoms in the WHO list of long CO symptoms 3 months after the COVID infection in the match study were roughly the same rate for kids but for adults it was higher for the people who'd had CO before then”