I am not going to tell you what you should or shouldn't do, as I think nobody can make that call but you.
However, take a look at the PDF file that I attached here, which is the service information for airbag units.
Basically, anything before '92 has a 15 year expiration date which you passed a long time ago. Anything after '92 apparently never needs to be replaced.
Even in modern cars, airbags can
sometimes accidentally deploy, so age is not the only factor. Bad luck seems to play a part in it. Boy, it must suck to be on the receiving end of it.
I am always aware when driving a car with airbags (my daily driver) to not have my hand covering the airbag portion of the steering wheel. If it were to go off all of a sudden (or someone pulls out right in front of me or something), I'd hate to get a degloving injury, which can and does happen with airbags.