If you look on the sidewall you will find the date stanped in on one side.It will be a 4 digit number, the first 2 numbers are the week and the second 2 are the year. Ex. 4919 would be the 49th week of 2019
My tires were made 4 months before Ithe date I purchased them... which is outstanding!
I just ordered a set of Continentals mine were made in the 48th week of 2018 so less than a year old. Not bad for a tire that was made in Portugal I think, and they have been stored properly so they are not deformed.