Neal Joseph Schon (born February 27, 1954) is an American rock guitarist, songwriter, and vocalist, best known for his work with the bands Journey and Bad English. He is Journey's last original constant member, having participated in every album and tour to date. He was a member of the rock band Santana before forming Journey, and was also an original member of Hardline.
By the time he was in his twenties Neal Schon was already in a band
The statement is ambiguous and open ended. He could have been in a band in his teens which is by the time he was in his twenties or he wasn't, the information can not be concluded from what is given.
( z1 have-org-role :ARG0 ( z2 person :name ( z3 name :op "Neal" :op "Schon" ) ) :ARG1 ( z4 band ) :time ( z5 already ) :time ( z6 by :op ( z7 age :ARG1 z2 :ARG2 ( z8 temporal-quantity :quant 20 :unit ( z9 year ) ) ) ) )