Cab drivers start band

Four taxi drivers have formed a band in Changchun, Jilin province, with the oldest member being 58 years old. Yang Jiamin, the oldest member, also the leader of the band, is able to play both western and Chinese traditional musical instruments including the saxophone, clarinet, guitar and cucurbit flute. He managed to find three other like-minded friends, and it seems that they are not far from their dream any more.

How old is the leader of the band?

A. 56 years old

B. 57 years old

C. 58 years old