Ill start with 9 years old. " Dimensional Accuracy +/- 0.05mm" "baseboard temperature"lol. And it still prints.
Wow…9 years…you’re a big boy now, @StreetSports …welcome to the first stage of teens club. 
To my shame, my filaments never get older than 12 months (at max)… I have an obsession to end them before the year is over… so no “for ever living happily after” …
I still have a few rolls of PLA/PHA from Colorfabb in 2,85mm. I bought them together with my first printer, an Ultimaker 2. That should be 11 or 12 years ago. I received both from my company and took all the colors I could get, also some that I never had use for 
Most of them have between 50…200gr left and still print like at the first day.
Although I wouldn’t buy them again because the steep price, the quality is really top notch. And the added PHA seems to do something.
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I’m pretty sure I’ve still got a 1kg spool with the name Makerbot on it, this is before they replaced those with a size they called “large” which was 10% smaller but they liked the (already expensive) price so they kept that.
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Hello There…this old man was going to make my first topic started about “old filament” but here it is.
Anyhow, I have 12 rolls of 6 year old filaments, PLA & PETG Poloroid and Paramount, purchased in California and then moved to South Mississippi. Some are still in vacuum packaging and some are opened not sealed. They resided in my woodshop for 5 years in a cardboard moving box, frozen and defrosted at least 8 times, subjected to triple digit temps and not less than 50% humidity. Most of the 3D “experts” advise me to throw them away and not risk damaging my new A1 printer. Bollocks!!!
I took one of the Paramount PLAs and gave it the bend test — sure enough it snapped like a dried twig — put it in a Polydryer box for 48 hours and then with generic PLA settings and leaving it in the Polydryer on continuous setting printed a Benchy. Well, it didn’t break my printer, it didn’t produce a pile of sphegetti and it didn’t produce a perfect Benchy. Lots of stringing but only a couple of “artifacts”.
I’ve read that even properly stored filament will “expire” within a few years. I don’t think so not for hobbyist like myself that’s not a commercial printer.
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