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Knowing your age accurately is actually a relatively recent thing. In the past, many people only vaguely knew their birth years I suspect, based on anecdata interviews of old people. Knowing age used to be an an upper-class thing for people who could pay priests to track it.
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The problem is judging people too heavily on age. Using the word "age" to mean "here is a lie that will make people treat me better" instead of "here is a precisely measured physical fact" is wasting good info.
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Except except age is not a “precisely measured physical fact”. It is actually really hard to estimate directly. What we do is use elapsed clock time as a proxy. The precisely measured physical fact is the state of an atomic clock somewhere.
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