Perhaps you could look into a glider rating? He'll be able to start soloing earlier. However, there is a downside in that, if he wants to go to powered flight, he would have to take the written test all over again.
Minimums for sailplanes (Courtesy of SSA
Student pilots may solo at a minimum age of 14 with a student certificate endorsed for solo flight at the discretion of a FAA-Certified Flight Instructor for Gliders (CFIG). Generally, 30 to 40 flights with a CFIG are required to solo. This is roughly equivalent to 10-12 hours of flight time and is dependent upon the progress of the student.
After solo, student pilots may qualify as a Private Pilot-Glider provided they:
Are at least 16 years of age; and
Have logged at least 10 hours of flight time in a glider and that flight time must include at least 20 total glider flights, and
Have 2 hours of solo flight time in a glider, and
Have passed the FAA written examination; and
Have passed the flight exam with a FAA Examiner.
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