My family and I were going through my grandmother’s apartment after her passing to get her estate in order. After all was said and done, I got a bunch of alcohol she had for guests mostly, including two types of whiskey (scotch and regular), some gin, and three flavors of vodka. I tried some of the Crown Royal and it didn’t taste too good. Also didn’t taste like the last glass of whiskey I had before. Of course I always hear about stuff aged 4 years or 12 years etc. so I wonder if it’s a “gone bad” thing or a me thing.
It may change taste profile depending on heat and sun/light exposure but it’s still alcohol unless the bottle is compromised and it evaporated.
Aging refers strictly to how long the alcohol was left in a barrel before being put into a glass bottle. A 10 year old bottle of scotch is still only a 10 year old even if it was bought in 1970.
I’ll add in her something I learned recently - whisky can become “corked”, ie if the stopper is made of cork, it can go bad and ruin the drink’s flavour. I thought this was just a wine thing, but apparently it can happen with whisky too.