For those who may be tempted to believe The Rocket can’t possibly be 43, we present the incontrovertible evidence -- his birth certificate, which given his continued domination on the mound may be the most intriguing baseball birth certificate since Satchel Paige’s. Clemens, too, might just pitch forever. The certificate from the Ohio Department of Health is dated Aug. 4, 1962 identifies him as “William Roger Clemens”, the 5th child of a Dayton truck driver named William Clemens and his wife Bessie. No mention is made for his height and weight, but we bet he was a big boy. Document reproduced in 1989 is an official copy with the Montgomery County seal. NRMT. Just as Clemens seems to still be.