Well I wrote a long thing on another group, I'll just say that the fingers and toes are the least of it. Oxygen deprivation in the brain from the altitude takes its toll. The Goddess extracts her due, the Goddess at the summit of Everest rides a Tiger, people come back from there missing pieces of their eyesight, portions of their brains etc. Other teenagers have died at altitude. If he lives to be 30 what will he think of his accomplishment then? What will he think of his parents? Maybe instead he can be the first 13 year old to die up there, nice record huh?
These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.