To decode tire dates:I have zero clue what the age is of the tires on the back of my truck
https://www.tirerack.com/tires/tiretech/techpage.jsp?gclid=EAIaIQobChMIwoe42Z2_-AIV2B-tBh3_FAR_EAAYASAAEgLOiPD_BwE&techid=11&ef_id=EAIaIQobChMIwoe42Z2_-AIV2B-tBh3_FAR_EAAYASAAEgLOiPD_BwE:G:s&s_kwcid=AL!3756!3!354820920605!e!!g!!how%20to%20read%20tire%20dates&gclsrc=aw.dsBut chances are, if you don't know when the tires were purchased, they're probably too old to drive on them more than a few miles an hour.
My '57 came with some from
I replaced the 20 year old original tires on my 1999 1 ton pickup last year. They only had 20k miles on them, but I didn't want to chance it with a yard of gravel in the bed.