This is audition is called the "Morning Musume. '16 Shinseiki Audition" 新世紀オーディション (New Century/New Beginning Audition).
http://www.musume-audition.com
Application deadline was 14th of January.
Hello! Base reported on Twitter that that girls from ages 10-17 are able to audition.
http://www.helloproject.com/news/4083/
・歌やダンスが大好き・自分の未来を信じて突き進みたい・自分の可能性を試してみたい・新しい自分を見つけ出したいそして・誰よりモーニング娘。が大好きな女の子を募集します。
And
- Like singing and dancing.
- Enough faith in your own future that you want to break straight through
- Want to test your own potential
- Want to discover a new version of yourself
- We're collecting applications from girls who love Morning Musume more than anybody else does.