I believe Joe Jonas was 16 years old BELIEVE IT OR NOT
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
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
i think he was 13 years old
He was 16 years old.
20 something