As for the value of these old bottles, it will depend on the type of spirit and the stated age (i.e.
A whisky with an age statement is known as guaranteed-age whisky.
The first written mention of Scotch whisky is in the Exchequer Rolls of Scotland, 1495.
Unlike wine, once whisky, and spirits in general, are bottled they don’t age.
Technically there can still be some changes going on, if let says the bottle was exposed to light for a long period of time, but for the most part, once bottled high proof spirits don’t age.
In 1851, Sir Edwin Landseer created an oil-on-canvas depiction of a stag in the Scottish Highlands called, "The Monarch of the Glen." An instant masterpiece, the painting was extremely popular through the 19th century.