When do all of the growth plates in the arms close? specifically the one connected to the bicep by the forearm, and the forearm one by the bicep.

Elbow ?: In females growth plates are closed 2 years after the onset of menses.( in general)... Most male growth plates are closed by age 18 or 19( exception being the growth plate by the sternum which closes last).90% ( or so) of long bone growth of the arm( humerus) occurs @ the 'plate' near the shoulder.Odds are that your elbow growth plates are closed.Hope that helps!

Varies: There is not a specific age. Some males may grow till they are 14 and then stop, while others may grow to the age of 21-22. Xrays show if the growth penates are open or not, but they do not tell when they will specifically close.