The final year of the 20th century was 2000 (not 1999) but a person in their 20th year is 19 (not 20)

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This one really did happen in the shower.

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People also turn 1 year old the day before the birthday. Like you said a babies first birthday is the start of their second year. Meaning you can legally purchase alcohol the day before your 21st or 18th birthday depending on your local laws.

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Mind blown.

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see also: Off-by-one error & Fencepost error

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well yeah years don’t have birthdays. Assuming year one was 1 and not 0 and age goes from 0 months to 1 year in the first year.

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If year 1 was relabeled 0 then that would make centuries more logical. But probably there would be illogical side effects that I'm having trouble imagining right now.

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I've heard about the "Korean age" where everyone is 1 at birth and gains a year at the same time on New Year's. Seems wacky until you think of it as how many calendar years you've been alive for. I mean, it's still odd but not as bad

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Indeed! And it gets even weirder:

A person is allowed tobacco and alcohol if it is after January 1 of the year one turns 19 (post-birth age). This is the "year age", which is basically (Korean age – 1), or when a person's Korean age is 20.

Ha! Thanx for the insight.

Jared White

ngl, I have spent way too much time thinking about those very points

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Trust me, I did too. I got so lost in the puzzle than the shower ran cold.

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Chicken-egg; post-space.....post.

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That doesn't sound right to me. Discounting leap years, you should turn 1 year old on your first birthday at the time of your birth (or considering the existence of leap years, 6 hours later than that, either the day of or the day before, depending).

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It might be a state by state, country by country thing. I know in Virginia it is the day before your 21at birthday based off some court case explaining the 365 days = a year thing.

https://www.abc.virginia.gov/licenses/retail-resources/preventing-underage-sales

When does a person reach their 21st birthday?
The attorney general's office has opined that a person attains his/her next year of age on the day prior to his/her birthday. (1963 Va. AG LEXIS 215; 1962-1963 Op. Atty Gen. Va. 87)

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I'm just high enough to wonder if this is somehow deeply revealing of human psychology.

Executive Chimp

Arrays start at 0. Counting starts at 1.