If the mask was not stored in good conditions (it should not have access to air) then in time robber get cracks and may brake when you'll try to stretch it or just won't be very tight around your head. Every filter has expiry date ( If I remember right it is 3 years).J23 wrote: Is it a matter of just filter or mask as well?
Gas mask is probably one of the most important piece of kit as if you'll get to the point that you have to use it then your life will depend on it (not if you use it to clean a toilet). Try to explain your wife that in shtf scenario she'll have to use 50 years old gas mask and outdated filter. I know what mine would say...


