In 2018, 55 is the most common age for an American (U.S.) Debra who is registered female with the Social Security Administration. It is the 85th most common female first name for living U.S. citizens. (By contrast, for Deborah: most common age is 56; it is the 61st most common female name.)
― Anonymous User 10/17/2018
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The name Debra was given to 37 girls born in the US in 2015.
This name is very rarely used as a masculine name, too. It just barely made the list of top 1000 boys' names in the 1950s. See the link on this name's popularity.