Is an opened bottle of 30 year old vodka still good to drink?

An opened bottle of 30-year-old vodka can still be good to drink, as vodka has a long shelf life due to its high alcohol content, which inhibits bacterial growth. However, its flavor may have changed over the years due to oxidation and evaporation, especially if it wasn't stored properly. If the vodka has been sealed and kept away from light and heat, it should be safe to consume, but it's always best to give it a sniff and taste test before drinking.