Nyogtha notes other factors then just time..... years ago I saw a temperature chart for gasoline oxidizing, jelling, varnishing, etc and it was VERY temperature dependent. Little aging happens during cold temperatures.
Likely the reason I have NEVER winterized a lawnmower in the last 50 years and they always start just perfect in the spring. Attempting the same thing with snowblowers....stored during summer of course....and the carburetor is always gummed up, splashing gas in it, running it at full choke for half an hour until it cleans up and can run without it still sometimes rebuilding it is necessary. Now, I carefully run snowblowers dry each spring to prevent the inevitable.