Youngest Challenger and Finisher

Jeff, I was curious who the youngest challengers and finishers are? My son Aiden is on track to complete the challenge this year at only 9 and I think that puts him among the youngest? I see a post on facebook that a 12 year old did it last year, and a 13 year has finished this year. So impressive! It's great to see young kids out on the trail, but it is a rare site. Thanks, Alon