Wine spoilage

[vhost]

I brought home a bottle of Lindaman's Sauvignon Blanc that I thought was '99 vintage. When I got home, I discovered to my horror, that I ended up with a bottle of '96. I took one of the bottles behind the display bottle (which was 99), and didn't notice the descrepency. Anyway, that seems a bit old, and I'm wondering if I should return it for a '99 or go ahead and drink it. Any thoughts??