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Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What's the big deal with very old/aged expensive alcohol?

I'm sure we have all seen in movies where some rich guy brings out a bottle of their most expensive alcohol, but why does aging alcohol make the drink better?  With a drink that was made 50 years ago, wouldn't it have expired? Are there any benefits for aging alcohol to drink later?

Edit:
More questions!

It appears that most people refer to the aging process inside a barrel.  So say for whiskey and rum, the drink is aged in a barrel and the length and time is then stamped onto the bottle?

Also, what about cases of wines that are 100+ years of age inside the bottle?  Does anything special happen and is it even safe to drink?
gpt
Whiskeys and rums are aged in barrels -- the longer the spirit sits in the barrel, the more complex the flavors get from the wood.

Many people believe that the longer the spirit ages, the better it tastes.

Alcohol doesn't really expire, and unless you leave it in the barrel it doesn't really age any further.