15 is old for a karting-to-f1 driver alredy..... but still worth a try if had a good finance (i mean real rich).
many driver like shumi brothers, raikonen etc....... was start at a very young age, around 5 or 6 years old.

did i spoil his mood ? sorry if i done that.
i just try to tell him some bcoz he doesnt even know 15 years old in karting was consider old.
btw, good is not enough, in car racing everything comes in, Alex yoong father spent RM20 million in alex carreer, as a i read from a local newspaper. Not just sit there like play GT4 in PS2 

yes sir... actually rm20 milion is not enough yet, he is still lack of track testing experience.

But as u can see the standard of all A1GP driver .... always crash, boom, bang...