This got me looking at my 18yr aged balsamic (that I've had longer than I care to mention) and it doesn't have a nutrition label on it. I did find an 18-yr that looked like it would be ok in moderation at 10 cal/tbsp and 2 grams of sugar [Ingredients: Grape must, wine vinegar, naturally occurring sulfites. No caramel color or additional ingredients]. I'm in no way affiliated and haven't tried it myself, but here's the link if anyone would like it:
https://theolivecellar.com/product/18-y ... c-vinegar/I did like the flavor the aged balsamic gave to a salad but I haven't been using it for quite some time. My mom had gotten them from a little shop and they told her there wasn't any added sugar, but since I have no idea what the sugar content is I'll probably toss my old ones out, hadn't even thought about the sugar