Terence "Geezer" Butler (born 17 July, 1949 in Birmingham, England) is the long time bassist for the heavy metal band Black Sabbath.
. . . He has been a vegetarian since he was eight years old and has been vegan for the past years.
If that's correct then he was vegetarian from 1957 - the last line seems to be missing a number of years, but the article was undated, so still not telling us much.
posted to a PETA website on August 17, 2007:
"All you heavy metal fans will probably want to throw devil horns in the air, because long-time vegan and Black Sabbath bassist Geezer Butler just got in touch with us from the road to let us know how he feels about KFC. Here's what he had to say about the Colonel's treatment of our feathered friends: 'Life is God's or nature's greatest gift. All life should be treated with respect and dignity. I am sure most people would be horrified at the way K.F.C. treats its chickens. People have a choice in what they eat, but those chickens do not have a choice in the way they are treated. If people let K.F.C. know of their concerns, then hopefully the chickens will be treated ethically.'
See also: Bill Ward - vegetarian since 1989 - and Ozzy Osbourne - who may have been mostly/partly/temporarily vegetarian, but the details are unclear.