It hasn't been made since the first batch of '05. You have to look at the date stamp on the bottom, it will begin with M02, M03, M04, or M0501 if it's green. The gold is good stuff from what I hear though...
BTW, the 5 quarts cost me around $10.00 I had my Auto Zone card and used it for a -$20.00 discount.
Not sure how long oil stays stable, especially synthetic, but I doubt that oil still in a bottle has much going against it. Example: http://www.gulfcoastfilters.com/1,000,000%20MILES.htm
This is a 1990 Peterbuilt truck with over 1 Million miles on it and dissasembled in 1999 and the engine checked for wear. They replaced the piston rings. Even poured the old oil back in after putting the engine back together.
Now THIS oil was heated, cooled, over and over. and at that posting then from 1990 to 1999 was 9 years. I doubt seriously that a few years in a bottle then will really cause too much deterioration.