I still have a few jars that were canned in 2008. I used one a couple of days ago and it was just fine. I usually use all my sauce up and I was surprised to discover a few jars in the back of the pantry. I didn't worry, though, because the color was good and the seal on the jar was firmly intact.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!