Very old cider vinegar

Found this way in the back of the pantry.
Its from 2016
Do you think its still good?
I like the mother”worm” created by the bottle neck, lol

Yes I believe it's still good. Part of what vinegar and pickling with vinegar make things last is the very low pH which makes an inhospitable environment for the bad spoiling types of bacteria.

I will keep her then. I think the cork kept it alive. I have bottles with metal caps that are 2 and 3 years old and the mother has not grown at all in them.

Thanks for the quick reply.😊