View Here : Numbers On Tires
The easiest way to find out the tire age is to look at tire DOT numbers. If you go to your vehicle and look at the tire you will find a DOT code somewhere on the tire. It is there but it may be difficult to find.
The ninth and tenth characters denote the week the tire was produced. The final number(s) signifies the year in which the tire was manufactured. For BFGoodrich brand tires, DOT markings related to the week and year of production will have an additional symbol for the decade of the 1990s.