I'm definitely a believer that whisky continues to "age" in the bottle, though very slowly. By age I really mean change. Things are always changing, and not always for the best. I have opened bottles, had a dram and disliked the contents only to find it much better when it sits for a few weeks. Some of the flavors or things I didn't like on the nose mellow out. There's something going on there. As for a "sealed" bottle aging, I'm sure it does as well, though very slowly.
I've actually started opening new bottles and letting the cork sit off for a few minutes before pouring a dram, which I also let rest for another 10 minutes or so before sampling.
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