Most estimates I've seen say that it starts to go bad after a year. That said, backpacking stoves are less complicated than engines, and if you know how to clean and maintain your stove you can burn white gas that is much older. My record is five years with no clogging, and only a slight drop-off in performance. Of course, I have no idea how long the stuff had been in the can when I bought it. I wonder if there's a date on the can . . .
I'm still using the gallon can of Coleman fuel that I bought in 1987. It's still going strong. I use it in my MSR Whisperlite and my 1960's vintage two burner Coleman camping stove.
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