Howdy Diesel-Jay,
Seen you around b/4 on another forum - I also have spent a lot of time on ford-diesel.com since buying my new '99 SuperDuty back in '98. I actually have a lower 3 digit user #! Have 60K on the truck.
From what I was told, the "born on" date can be found on the I.D. tag on the left side of the tractor. As I understand it, the "Unit #" is what is referenced. The first digit of the unit number is the year of manufacture - a "0" is 2000, a "1" is 2001. The second digit is a character - the letter stands for the month - "A" = January, "B" = Feb., etc. The next two digits are the day. Hope that helps.