More current event knowledge on Port Vintages last week from Greg B. Carlstrom, guildsomm user, Rachael Ryan and Xoel Cantero Alvarez.
This week: What is the Barossa Old Vine Charter? Is there any other systems like it in the world of wine?
Rioja Vinedos Singulares requires 35 years old vines. Not really the same as Barossa OVC, but still has a requirement for vine age.
Another initiative in Spain is the Vino de Vina Vieja, which isn't quite recognized yet.
South Africa has a couple, The Certified Heritage Seal (SAWIS approved), and the Old Vine Project.