In 2018, 85 is the most common age for an American (U.S.) Tillie* who is registered female with the Social Security Administration. It is the 3, 552nd most common female first name for living U.S. citizens. *as a first name, not a nickname.
― Anonymous User 10/11/2018
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The name Tillie was given to 41 baby girls born in the US in 2012. The spelling Tilly is currently more popular.