My grandfather was given bottles of whisky for Christmas, many years ago. There are still some left over after all this time and I picked them up when they were going to be thrown out. I'm not really sure if they're valuable, in fact I'm here to ask whether or not they're DRINKABLE.
I'm not much of a (whisky) drinker myself, and I don't have a clue how long whisky lasts before it goes bad. I'd imagine that an unopened bottle can last for a while, as it's not wine or even beer, but I'd rather ask some experts.
The oldest bottle is from the late 60's, and the earliest that is labeled is from 81. They were stored in a basement storage in a box for most of their life. They are unopened, and most had boxes around them (so there was probably very little, if any, light exposure).
Does light exposure matter? I just took them out of the boxes and put them on a shelf. Is this wise?
Also, if I wanted to drink one of these, for example, could I? How does whisky flavour change over time?
There's also a Cognac and some brandy...if anyone knows about those too...
Thanks.

