Private Reserve works for this as well - but really, the most important thing when it comes to whisky is how you store it. The less air that's in the bottle, the longer it will last - also keeping it out of light. If your bottle is down to 1/3rd or 1/4th remaining it will change sooner than a full bottle. Changing isn't spoiling though - it's somewhat the same as the wine oxidation issue, but it has a different chemical reaction to the oxidation. It's still OK to drink, and some whiskys actually improve this way.
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Private Reserve works for this as well - but really, the most important thing when it comes to whisky is how you store it. The less air that's in the bottle, the longer it will last - also keeping it out of light. If your bottle is down to 1/3rd or 1/4th remaining it will change sooner than a full bottle. Changing isn't spoiling though - it's somewhat the same as the wine oxidation issue, but it has a different chemical reaction to the oxidation. It's still OK to drink, and some whiskys actually improve this way.