Here's something I just saw on the Wall Street Journal's web site:
"You have hit upon one of the biggest mysteries in the auto industry. With many airbag systems reaching the 10- to 20-year mark, many drivers are asking how long they can be expected to last. For now, the best you can do is have a mechanic check the system. Such checks can at least tell you the electronics are still working. The worry that the bags themselves could degrade with time seems less well founded because the material is packed tightly, away from light and other harmful elements. In 1992, the Insurance Institute for Highway Safety crash-tested a 1972 Chevrolet Impala, and while the car's dashboard clock had stopped working, the airbags performed flawlessly."
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