The third exponent of 26 (the 26th letter, Z) is 17,567. If you subtract the third exponent of 11 (the 11th letter, K), which is 1,331, four times (the total number of the letters of KZ's name squared) you are left with 12,252. Adding 37 (26+11, the letters of his name), you are left with 12,289, or 1/22/89. Leaving KZ to be 21 years old.

My first guess ever on this thread.