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The second lead paragraph ("Chinese age reckoning, the first of these methods [...]") contains no citation. From perusing the article, I have no idea whether any claim in that paragraph is true. Y. Dongchen (talk) 13:00, 15 September 2024 (UTC)[reply]
Because sometimes a lunar year is shorter than a solar year, a person can turn 3 (under East Asian Age reckoning applied to lunar calendar years) when they are 0 (before they reach their first birthday) under the Gregorian (solar) calendar. Generally, one can be x + 3 (East Asian) when one is x (Gregorian), etc. if there is a short lunar year.
Similarly, because a lunar year can be longer than a solar year, one can be 1 simultaneously under both system — within the same lunar year as born, but just after the first birthday using solar years. Generally, one can be x under both systems when there is a long lunar year.
These calculations seemingly shows that the article's statement
Ages calculated this way are always 1 or 2 years greater than ages that start with 0 at birth and increase at each birthday.