"DM solo'd / qualified for both his Fixed-Wing and Helicopter's licence at age 14, on his birthday."
This is why i phrased it as such. He certainly did later go through the formalities required of such documents when he turned 'of age'.
The question of age at the time of solo, is more of a matter of legal formality. He had the skill-set to solo at age 14.. which meant that he merely needed to meet all the other standards related to a private aviation licence. Born into an aviation-oriented family.. this was a right of passage, a Coming of Age, just as much as the Bar Mitzvah is, to a Jew.
There is plenty of citations available on google, to point that he held multiple aviation licences.
His life, and mine, have many eerie parallels. My Sunday afternoon "baseball game with dad" was chasing the $50.00 cheeseburger across Ontario to many, many airport greasy spoons. The only difference really between me and DM, is a potential career in aviation was destroyed by bad eye-sight, not a moral compass spun adrift, or not there to begin with. I don't know whether the standards have changed since DM solo'd 18 years ago.. i haven't kept up with that information since the eye-test spelled out "HA-HA, you lose!" about 30 years ago around my 16th birthday, and more than a few hours of ground-school in air-cadets... I do know that my late father got his pilots licence, at age 16, in '65. 2 years before he got a drivers licence.
Respectfully, and FWIW.