What long term health problem would that be?
For starters and as mentioned above, kids in that age range are at least 4x more likely to develop heart inflammation than have COVID complications. This is straight from the CDC data and is indisputable. CDC has called an emergency meeting over myocarditis issues alone.
If you haven't checked out the 3-hour interview with Dr. Robert Malone, the inventor of the mRNA technology, you really should. It's quite illuminating.
https://twitter.com/RWMaloneMD?ref_src=twsrc^google|twcamp^serp|twgr^author