I have a few bottles of Villa Vainilla Vanilla Concentrate (one open, a couple unopened) that I got in Mexico on a cruise some years ago. Today I noticed that they have an "02 20" expiration label on the bottom of the bottle. I've used the open bottle a couple of times since February without issue so I'm wondering how long it will really last. It contains alcohol but the label doesn't say how much (their vanilla extract that you can buy online is in 35% alcohol but that's a different product than the concentrate, which is not available online). Certainly the quality will degrade over time but does anyone have any thoughts regarding when it would actually expire from a food safety perspective and be unusable?