It's super average for an 8th grader (or anyone) to snore. An 8th grader may take it the wrong way, but it's useful information to have, because snoring can be totally innocuous or it could be totally disrupting their sleep. Someone who snores would do well to see a sleep doc and do a sleep study.
I come from a family of tall, thin people and every single one of us has had sleep apnea since childhood. None of us started treatment until we were adults
This is not true. There are plenty people who snore but who do not have any negative effects from it, e.g. sleep apnea.