A few things will make a difference here. First off if the fuel was stored in an airtight container then yes it's going to be just fine. If the fuel has been stored in a container that has allowed constant exposure to air, no matter how small it could have absorbed enough moisture to not be useable. Obviously the humidity levels of you particular region is going to have an influence. A guy in Nevada is going to have less of an issue then a guy in Florida. I think we will all agree that the deciding factor here is how much water is in the fuel as the components in fuel don't go bad per say. A good test is to take your capped plastic fuel jug and place it in the sun for an hour or so. If droplets of moisture form in the tapered portion of the jug guess what? That's not fuel, it's water droplets. The other thing to consider is that some engines will run just fine with a small amount of moisture in the fuel, some will not.