How old was someone, knowing that he was born in 1821 and died in 1881? Maybe 1881-1821=60 years old. But born 1821-01-01, died 1881-12-31 gives 61 years old, while born 1821-12-31, died 1881-01-01 gives 59 years old. But there are countries where the birth of a child is her first anniversary. But there are lunar years. And what remains is something between 58 and 63 years old. When someone is reported as 1821--1881, this is even worse. And therefore, the question is not about what is written in the database, but about the confidence we can give to the way the data were collected to build the database. E.g. what says Wikidata about the death of Kim Hong-do ? Pldx1 (talk) 08:25, 30 November 2015 (UTC)
“doctors who graduated before they turned 20” – How would this query look like?--Kopiersperre (talk) 15:41, 30 November 2015 (UTC)
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