If the lid is still sealed and the jar under vacuum, there's a very good chance that the contents are still sterile.
Quality of contents is another matter entirely. Something that old would likely be pretty nasty tasting, with an awful texture.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.