With strong math aptitude I would watch for interests to develop in engineering. I would stack up most engineers in fields like electrical/electronic engineering against most applied mathematicians in a contest. Of course applied mathematician is on the math side of technology so that is an option as well. I have been a college professor of Mechanical engineering for a decade and a half and I can assure you that the math skills come in there very well. If he stays strictly in the mathematical area, get him into a good university math program, and he'll take it from there if he excels
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The thing that hath been, it is that which shall be; and that which is done is that which shall be done: and there is no new thing under the sun.
All the days of my appointed time will I wait, till my change come. Thou shalt call, and I will answer