Well it seems we have kind of 2 different themes here: As far as air bags, on my 98 built in June the sticker says to replace the airbags in June 2013 so that's 15 years exactly. Not sure if the 89's were rated for the same life span. All airbags should have a date code on them so you can tell how old they are. I think even seat belt assemblies have date codes on them (many parts do actually).

As far a squeaky steering wheel my car has a similar sound once in a while. Some times when I steer right the wheel starts to have a "chirping" or cricket sound. It has been colder lately so not sure if it is temp related. Doesn't seem to occur when I steer left. I was thinking maybe the electrical contact also.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra