They no longer use a best by date. The bottles have a date stamped on them when they where tested. The sticker is the lot no. and date filled and you still rotate your cylinders.
02 does not go bad, the tanks need to be tested every 5 to 10 years depending if it's aluminum or steel. If your willing to try what you have sniff it first there should be no odor.
Brewed 10 gal of a American pale ale using 10 oz. of cascade hops pellets today. Jaybird's 15" false bottom with level 3 stand did the job, no need for a hop spider or a trub filter.
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