Does aged sparkling grape juice become wine or vinegar or poison?

Aged sparkling Grape Juice does not become wine, as it lacks the fermentation process that converts sugars into alcohol. Over time, it may ferment if exposed to yeast and air, potentially turning into vinegar, but this is not guaranteed. It will not become poison unless contaminated with harmful substances. Generally, if stored properly, it will remain non-alcoholic and safe to drink.