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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