I'm sorry but I think you are all missing the point.
What this young man needs to do is invest in a Class One CAA medical. That way he will know for sure if he has any aviation related medical problems to affect his future.
I put two of my sons through a CAA Class One when they were 14 years old. One of them had an eyesight problem so we were able to point him in another direction before he got to the age of 18 and had his heart set on becoming a professional flyer.
The second one had a very minor heart glitch which the best experts in the land agreed that he might have a 10% need for a pacemaker when he is 65.
He is now in his third year as an airline captain.
It will cost this young man (or his parents) somehwere around £300 to have a Class One done by the CAA but he will then know exactly where he stands. As a once only exercise, it had to be good value and it could save you a fortune in the future.