Question: A singer who is a quarter Japanese, a quarter Chinese, and half German, is a member of a Japanese boy band that is managed by Johnny & Associates, and had an average age of what when they debuted?
Sentence (from "Marius Yo"): Marius Yo (マリウス 葉 , Yo Mariusu ) is a quarter Japanese, quarter Chinese and half German, singer, songwriter, actor, and "tarento" under Johnny & Associates and Pony Canyon.
Relevant evidence: Yes