The Japanese rapper SKY-HI is curently scouting people to form his first own boygroup for his own company that he opend up last year and he is revealing each person who passed the audition one after another and today he revealed the 4th dude and ...
His name is Rui Kawashima and he is only 13 (!!) years old ... depend on if he allready had birthday or not he is either born in 2007 or 2008. He doesn't even looks like if he would be 13 years old ... 
Thats nothing ...
China:
Mini Girls - debuted 2016 as the member used to be 4-6 years old
BOY STORY co-signed with JYP Entertainment - debuted in 2019 as the member used to be 11-14 years old
Korea:
Hie Cutie - The group debuted in 2018 as the girls used to be 11-13 years old with an average member age of only 12.3 years old
LiSO (Little Sonyeongdan) - debuted in 2017 as the member used to be 9-11 years old. They are still together but didn't released anything since their debut no more
Na Haeun - She debuted in 2019 as she was 8 years old as vocalist. She only had 1 song so far but she is known in the public since the age of 5 after she apeard on a TV show where she cover-danced to some songs
Japan:
SUPER DRAGON - The group debuted in 2015 as 3 member were 12 and 2 member 11 years old. The oldest of the group was just 15 back than
Genjibu (Genin wa jibun ni aru)- They are signed to the same company as SUPER DRAGON and debuted in 2019 as their youngest member Masaya was 13. Genibu's youngest member allready debuted 1 year before as actor at the age of 12
SexyZone - As they debuted in 2011 the group's member Marius was only 10 years old. Because of all the idol-stuff he is curently on a hiatus from the group to focus on university (Marius revealed he would go to university from 8am to 4pm and train with his group from 5pm to sometimes 3am and that every day of the week so he was pretty feeling fucked up after 10 years so he said he will most likly come back to the group when he finishes University)
Furin - they are a kids-group debuted in 2018 as the member were 8-11 years old. They are also curently having the 10th most watched JPop-MV on Youtube with over 265 million views
SexyZone - As they debuted in 2011 the group's member Marius was only 10 years old. Because of all the idol-stuff he is curently on a hiatus from the group to focus on university (Marius revealed he would go to university from 8am to 4pm and train with his group from 5pm to sometimes 3am and that every day of the week so he was pretty feeling fucked up after 10 years so he said he will most likly come back to the group when he finishes University)
ok wait wait hold up one moment. A group called SEXYZONE had a 10 year old in it? 
But yeah there are a lot that debut in super young I just tend to forget about them 
me at 13: closing the fridge slowly to see when the fridge lights turn off
him at 13: getting ready to debut
See the post I did about Japan / Korea / China ...
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BTW here are some examples of other groups:
This is Masaya Sakuragi from Genjibu, he is 14 years old and debuted at the age of 12 as he was an actor before he debuted with his group at the age of 13. (Before anyone ask, Masaya was born in 2006). Masaya is the youngest member of Genjibu but looks older than some of the 17-19 year old members ooof
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This is Raku Shibazaki from SUPER DRAGON. He is curently 16 and turns 17 this month. Raku debuted with SUPER DRAGON as he was only 11 years old. He is by the way also the youngest member but he wasn't the only one who debuted at 11 years old with SUPER DRAGON
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This is Ren Shuang. He is 13 years old and turns 14 this month. Shuang is the youngest member of BOY STORY and debuted in 2019 as he was 12 year old but even tho he debuted at 12 years old he was allready active with his group as he was only 11 years old pre-debut.
That's SexyZone (But without Marius)
As far I know Marius, fullname Marius Julius Seriyu Schmidt Yo or only known as Marius Yo is half German, quater Chinese, quater Japanese and was born in Germany. As he was around 2 years old his family moved to Japan. Marius is fluently in Japanese, English, German and French. Marius curently turned 21 years old a week ago.
The other member are 23 (turning 24 this year), 24 (turning 25), 26 and 27 years old
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