I read somewhere that he was 9...
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Bowser Jr. is 9.
Yes, Bowser raped peach while she was kidnapped she wasn't saved until after the baby (Bowser Jr.) was born.
Well Bowser has 7 son's but the most common one is Bowser jr. Others call him"Koopa Bowser Jr.", "Koopa kid", or Baby Bowser, although Baby Bowser is a different character but hes mostly called Bowser jr. Because he looks more like Bowser then Bowser's other kids his other sons are Ludwig Von Koopa, Morton Koopa Jr., Larry Koopa, Iggy Koopa, Lemmy Koopa, and he has one daughter: Wendy O. Koopa
to unlock Bowser jr. all you to do is play as Bowser in classic mode 1000 times
OK now Bowser JR's Mother is bloweta. its the only good explanation.