Well done to him. Just hope he isn't sick of he job aged 29
As for getting the exams all done at an early age. It's not uncommon. Best time to do them when you're young and eager.
My wife did her school exams when she was 15 and was in college aged 16. She wasn't unique in her family either. I wish I was half as clever. Hopefully our son will inherit that side of the family's abilitys.
What people forget when they mention young pilots is that it's not really new. 18 year old Lancaster pilots were not rare in the RAF at one stage.