The aging process of spirits does two things: infuse flavour and reduce the burn.
By aging in casks, flavours seep into the liquor. More flavour=better booze.
The alcohol evaporates during the aging, lessening the burn, giving a smoother drink. Less burn also bring out the flavours better. This is also part of why it’s more expensive. A 100L of whiskey might only have around 90L left after a decade. The taste gets better, and the costs per liter sold increases
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