What is the proof of this Yellowstone bourbon now?

It should be about the same proof. At that proof nothing could grow to further ferment it. It should be fine. Some of the best stuff I ever had came out of a bottle that was at least that old.

First, let me say I am sorry for your loss. That is a tough job.

If the cap was on tight, the proof will not change. Distilled spirits last forever.

The alcohol content does not increase just because it has been sitting around. However, the character of the flavors tend to change. They tend to mellow and blend, so it’s likely to taste pretty darned good.

It’s most likely continuing to mellow, like a 1000 year old egg. :-)

I once lived in a house where the prior owner made home made apricot brandy and stashed it under the house. Found a few bottles once and oh my! Curled your hair, that stuff did!

I’d put it in a first aide kit for snakebites and arrows in the back.

Gah! Makes me shiver just thinking about taking a swig off that bottle! lol

Maybe make a time capsule for the grandkids. haha

There’s no proof at all. We have to take your word that there’s really a bottle.