How long can you keep a beer in a keg?

[Bugaboo]

How long has someone kept beer in a keg? I'm talking outside of a fridge at ambient temperature in a corny

 

[JRems]

Not from a corny, but from a 1/4 barrel keg I had a 4 year old N'ice chouffe and it was still very tasty.

 

[lumpher]

if you keep it charged with co2, i keep it as long as i can stand it. i have 1 been in the keg about a year, and my mouth is watering thinking about it

 

[Eisendrath]

I had some once from a corney that was 4½ years old.
It was stored in a basement with CO2 pressure on it. It was great.
I think that having no "air" in it and good sanitation to start, it may last a good long time.