Can white vinegar expire

When a bottle of vinegar is opened, the mother of vinegar may develop. It is considered harmless and can be removed by filtering. Colloquially-collected knowledge recommends an expiration or shelf-life date of 12-18 months, although no reference explicitly states its toxicity. Various records can be found warning of decomposition of flavoring elements, such as whole leaves, prepared in the vinegar.

Though I'm not sure what the deal is when the bottle hasn't been opened. I think it's almost always okay to use, just may taste a little funny after a while (that's plain white vinegar, not with added leaves/etc)