I hope to be A ccie ... someday, I'm too late te become the youngest... but still, I don't think a Ccie will be very valuable for someone aged 15-16. They will eat you alive in the business...
You can maybe be a very good technician, but you wouldn't be able to stand your ground in the real world.
If you really want to be CCIE. I would suggest by a CCNP at 18, start a nice job (engineer job would be impossible as start-job, but after a year or sthing you can go there)... get some experience in the real world... and be a CCIE on your 21-22th... with 4 years of business experience + networking experience, your CCIE starts to get its value... else, I think no-one would 'believe' you.
Rizni Kariapper currently residing in the UK has become the Worlds Youngest CCIE (Cisco Certified Internetwork Expert) Holder. He was born in Sri Lanka and moved to Canada at an early age. Now living in the UK, passed his CCIE Voice at an age of 18.