I must commend you for your investments at a very young age, if you are still doing it till now well done buddy for going into the investment route. However, I've got to advice you to slow it down a bit because as an adult teenager investing in Bitcoin can be tricky. While Investing in Bitcoin you need to know that Bitcoin's value is likely to go up and down and you could win or loose your money so be careful and guarded.
I'll say it oppositely, he can go wild and all out with investments and pursue Bitcoin while he's young. There is so much space for him to do whatever he wants to do and just enjoy the journey. If he fails, he can always start again but if he succeeds, he can proceed to keep on doing it or choose another path that he may like when he's a bit older. That's what I can say to him, he just have to enjoy each buck that he's got and be consistent, soon he'll learn the other important things while gaining experiences.