Finally I get to post on helping someone rather than asking for help :slayer:
I used to work in the airbag industry.
The spec for all airbags that we used to make is that they are designed to work
at least until they are 10 years old. That is very difficult to engineer and manufacture to (wrt controlling complex gases inside etc), so in reality they are generally engineered to work well beyond that because if they didn't the OEM would not be best pleased to have his name splashed all over the papers or God forbid VOSA had to enforce the "R" word (recall), sssshhh I mentioned the R word and got away with it (see faulty towers sketch about WW2), the R word was (not sure if if is the same now because I have left the industry and alot could have changed) something no one tempted fate with - not even jokingly.
I remember vividly being on a training course in 1998 with other automotive suppliers when someone attending the course had to be pulled out by his MD on the phone (no mobiles for us plebs then - ah the good old days). They supplied the ABS systems to BMW for the then new 3 series (E46 for the anoraks like me) and they didn't
seem to work and the R word was mentioned. All hell broke loose for this poor chap. Airbags like ABS are safety critical items and go through extensive qualification trials (ageing in particular) to prove they are up for the job (I am not trying to suggest that airbags are perfect however - no man made object by definition can be as I understand it).
Thankfully now, we have things like I'm a celebrity get me out of here which makes the front pages of the most newspapers rather than the trivia like whether you airbag is not up to the job (ah the good old days - how I miss them)
HTH
As an aside, from AndyRKett's post above, I was always taught that SRS stood for Safety Restraint System, however coming from Hartlepool, we only pick arguments with Monkey's (French ones at that) in the hope/belief that we can win them with a modicum of conviction - go on hang him he's a spy all day long - ah the good old days - you get the drift