Hey Peter,
Thanks!
Radio Carbon dating is used for authenticating rare vintages of wine[0], but it's a minor test for the most part.
In modern wine collecting, almost all of the fakes are focused around a few _Gran Cru_ lots of small vineyards, like chateau lafite or Petrus.
It's actually not that hard to find wine from the 60's through 70's (or earlier. Counterfeiters use real lesser wine from the right time period, and forge the label and bottle - assuming they can't find an empty bottle from the actual production run! These wines easily sells for upwards of ~$10,000 to 3 - 4 x that.
So radio carbon dating is only marginally useful in wine;
you need to use stable isotope ecology to see if the vintage matches the right terroir[1].
To make it even harder, most of the top vintages of French wine illegally imported grapes from neighboring regions to increase their complexity and overall flavor - this was a known but secret practice for about ~100 years, and since the French AOC[2] cracked down on it, there are concerns that modern wine lacking this complexity from blending will not age as well over ~20+ years.
I hope this information is helpful!
[0] http://www.acs.org/content/acs/en/pressroom/newsreleases/201...
[1] https://en.wikipedia.org/wiki/Terroir
[2] https://en.wikipedia.org/wiki/Appellation_d'origine_contr%C3...