It seems many folks use the vintage label strictly based on age, not quality or any other enduring qualities.Which is arguably correct, as TPReaves and Rrog have indicated. "Vintage" can indicate superiority in the making of certain wines, such as Champagne, but outside of that particular context it arguably relates just to age and not to quality.
http://www.merriam-webster.com/dictionary/vintage
Regards,
-- Al