Why do older generations not get drunk as much as younger generations?

Both of my parents and all of their friends use to drink and get drunk frequently in their 20's, now they're in their mid-50's, and while they do enjoy drinking socially, they don't get drunk at all, they just drink it sensibly as if it was water. Where as my friends will go to the pub and get to... show more Both of my parents and all of their friends use to drink and get drunk frequently in their 20's, now they're in their mid-50's, and while they do enjoy drinking socially, they don't get drunk at all, they just drink it sensibly as if it was water.

Where as my friends will go to the pub and get to the point where I need to carry them home because they're so drunk.

Why? Do older generations get bored of getting drunk?
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