Airbag life expectancy has been expanded to 15 years, so the life expectancy on the years you are looking at passed between 2001 and this year. Really not a problem. I purchased my '86 560SEL from a salvage yard after it had thrown the driveshaft in 2000. The resulting impact of the shaft to the tranny hump was sufficient to deploy the airbag, it worked perfectly.
I would imagine the life of the bag and deployment system is much longer than speculated by MB, simply because they were a new item back then and no one knew how long they would last. After rebuilding my car and using an airbag from another scrapped 126, I have no doubts it will function as designed if the need be.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.