Does nitrous go bad?

I have nitrous that has been in a bottle for almost a year and a half, is it still good?

I bet it's fine.......A friend of mine had an old tan (huge) 20 lb NOS brand bottle that had been sitting full in his garage for almost 10 years:D.......I blasted through every bit of it......It felt every bit the same as new:cool:

no shelf life.......should be as good as new.......