Frankie Jonas is 17 years old (birthdate: September 28, 2000).
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He is the bonus Jonas!! Frankie is the Jonas Brothers' youngest brother, but Frankie can't join because he's 9 or 10 years old. n he cant sing n his to young
he is 8 year old
Frankie Jonas was born in 2000 therefor he is ten by jaine stephens
Idk if you meant all four of them or the youngest one but I'll just name all Kevin (real name Paul) Joe Nick Frankie
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