Johnson , who will celebrate his 46th birthday on Sept. 10 , is hopeful of returning to the Giants ' starting rotation .
Johnson , who will celebrate his 46th birthday on Sept. 10 , did n't rule out pitching out of the bullpen , either .
Johnson , who will celebrate his 46th birthday on Sept. 10 , is hopeful of returning to the Giants ' starting rotation but did n't rule out pitching out of the bullpen , either .