I was told by an employee here that it was illegal for me to be driving on tires 10 years old. I'm trying to find the law and I can't find it. Can someone send me the resource they are citing?

Tires do dry rot. It there is no crack in the tire they should be safe. I don't know of any law. They probably worry about liability and they make money on new tires. Try a small independent shop.

I don't know about any law but if the tires are more than ten years old and have mostly been outside, I would change them.

If the tires aren't safe to drive on, they might not be allowed to let someone drive it off.