In 2018, 22 is the most common age for an American (U.S.) Justin who is registered male with the Social Security Administration. It is the 58th most common male first name for living U.S. citizens.
― Anonymous User 10/16/2018
7
According to howmanyofme.com, there are 73 people in the U.S. named Justin Case!
Also German:
https://de.m.wikipedia.org/wiki/Justin_(Vorname)
https://de.m.wiktionary.org/wiki/Justin
https://en.m.wiktionary.org/wiki/Justin#German
https://www.beliebte-vornamen.de/5131-justin.htm
https://www.behindthename.com/name/justin/top/germany
https://www.behindthename.com/name/justin/top/austria