If it was after 2000 shouldn't they have 4 numbers instead of 3? They have some fine cracks in the tread but I would have never thought they were 14 years old.
The production date is the last 4 digits in the DOT number. What you've posted is the first group. The production date is usually in a oval kind of embossed in the tire. Something like 3602. Which would be the 36th week of 2002. There won't be any letters in that group.