An archaic abbreviation for 'aetate' or 'aetat,' Latin terms meaning 'aged' or 'at the age of,' used in historical documents to indicate someone's age.
From Latin 'aetate' (ablative of 'aetas' meaning age). This abbreviation appears frequently in genealogical and historical records from the medieval period onward.
When you see 'aet 47' on an old tombstone or document, you've found a coded way of saying someone was 47 years old when something happened—genealogists rely on these abbreviations to decode history.
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