It's not always younger readers, either. For YEARS, I had a reviewer to a series I'd write constantly telling me "You should do a chapter on this, you should do a chapter on that". I got curious and found their twitter, and they were around my age (20s to 30s). Eventually I-got tired of it and blocked them on FFN, just for them to come back as a guest and continue the same nonsense. Eventually I deleted enough of their reviews that they seem to have given up.