Don't know why you thought it necessary to start your post with his birth and death dates but thanks anyway ....
Personally I don't think age comes into it really, to a point anyway. If he'd have been in his early 20's then I would have agreed with you, but by the time he's 33 he's had about 20 years experience in the Martial Arts.
It's not always about the number of years you have under your belt. You could have someone in their 50's who by your argument would've gained enough years to have earned the right to be called a Grandmaster, but he might have only trained three times a week. Alternatively you could have a man in his prime like Bruce Lee who trained 6 days a week. If you added up the hours of training completed by each you'd probably find that the later actually trained a lot longer than the former.
Kev