Well, now we circle back to your original post after all your arguing and snarky answers to people who do, indeed, know that you should replace your tires.
Yes, LOOK at the date code. If it is more than 10 years old, the tires should be replaced even if the tire has plenty of tread as many here have already posted.
https://www.tirebuyer.com/education/how-to-determine-the-age-of-your-tires
Why?
https://www.edmunds.com/car-care/how-old-and-dangerous-are-your-tires.html
If you really want an objective measurement then take a durometer tester and determine the Shore A hardness of the rubber. 80 at room temperature (70F) should be your limit.
Now do you have some snarky comment on the advice given?