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I guess we are all on borrowed time, but the terms of our loans may vary.

All joking aside, "I don't know" would be a better answer.?

I do know that they are made of good heavy rubber, and the fact that they are in the shade should help them live longer. Just getting down there with a good light and looking at them, and feeling them with your bare hands can give you some idea how healthy they are. Cracking even on the surface, would be an indicator that they are aging, (but you already know that haha). What tends to do them in is driving with little or no air in them, especially over rough roads or terrain.?