This page will help determine when the tires were manufactured:
https://www.tirerack.com/tires/tiret....jsp?techid=11
Tires Manufactured Since 2000
Since 2000, the week and year the tire was produced has been provided by the last four digits of the Tire Identification Number with the 2 digits being used to identify the week immediately preceding the 2 digits used to identify the year.
Example of a tire manufactured since 2000 with the current Tire Identification Number format:
In the example above:
DOT U2LL LMLR 5107
51
Manufactured during the 51st week of the year
07
Manufactured during 2007