QUICK! Does port go off?

[NoBiggy]

I've got two bottles, 10 year old and 20 year old, bought them last Christmas. Will they still be good, or will they be vinegar?

Sorry for cluelessness - I only drink beer!

No it doesn't generally as the sugar content is high.

It does go off but it lasts a long time when in a sealed bottle so if you've not opened them they will be fine. If they have been opened then they will have deteriorated but it wouldn't make you ill if you drank them - they just wouldn't taste as good. Only way to know is to try a taste

Thank you. They are still sealed so I guess they're still pristine!