Kevin is 20, Joe is 19, Nick is 16, and Frankie (not in the band) is 8!!!!
I believe Joe Jonas was 16 years old BELIEVE IT OR NOT
Because they are all Jonas and they are brothers.
he was 18
he was 13 years old when they started the Jonas brothers.
the Jonas brothers will never be old they rox and there hotties there are 3 of them triple threat
Franklin Nathaniel "Frankie" Jonas. He is ten years old and his birthday is 9/28/00.
The Jonas Brothers love all their fans.
He was 14!
He was twenty this august.
he was 11
79
Jonas Brothers little Brother Name Is Frainkie and he is 9 years old