On my 1991 Lexus LS400 (airbag equipped) under the sunvisor it states that the airbag system should be inspected by the dealer 10 years after the date of manufacture and every 2 years after that, but a Toyota-Lexus tech told me that was only a precaution and it was not necessary and the system would be fine decades down the road.
I have a 1988 Mercedes, which is an even older car with an airbag and I have been told by other 80s MB owners that have had crashes that the bags inflate fine.
My grandmother had one of the first cars with airbags. It was a 1974 Oldsmobile Toronado (airbags were optional on certain full-size 1974-76 GM cars and only about 10,200 were equipped). Anyway in 1987 my uncle crashed the car and the airbags worked fine. I later talked to someone that had one of these with the airbags that they were going to put in a salvage yard because it was in such poor conditions... he deliberately blew the bags and they worked fine. As long as the "airbag", "SRS" or if I recall on my old 1992 Park Avenue and 1991 Camaro "inflatable restraint system" warning light is not on, then it should be fine.
BTW, the 91+ Park Avenue earns very high scores in crash tests.