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Related: About this forumAge Related World Series Pitching Records
Age Related World Series Pitching Records: The oldest pitcher (39 years, 7 months, 13 days old) to throw a complete game during a World Series was Grover Alexander, on October 9, 1926.
The youngest? Joe Bush, 20 years 10 months 12 days old, on October 9, 1913. Jack Quinn holds two age related Fall Classic pitching records; on October 12, 1929, he became the oldest pitcher (46 years, 3 months, 11 days old) to start a game, and on October 4, 1930, he became the oldest pitcher (47 years, 3 months, 3 days old) to relief pitch in a game. The oldest pitcher (38 years, 1 month, 18 days old) with a World Series shutout was Randy Johnson, on October 28, 2001, and the youngest (20 years, 11 months, 21 days old) was Jim Palmer, on October 6, 1966.
https://www.baseball-almanac.com/rb_ws5.shtml#:~:text=Age%20Related%20World%20Series%20Pitching,%2C%20on%20October%209%2C%201913.

WestMichRad
(2,193 posts)…who is starting tonight for the Astros, is 39 years, 8 months and 8 days (as of today, if I’ve done my math right: birthday Feb 20, 1983.) So he has a chance at becoming the oldest ever to pitch a complete WS game… but that ain’t gonna happen, he hasn’t pitched 9 innings all year, has he?
But I wouldn’t bet against him racking up at least 10 K tonight! Even against the Phillies, who don’t strike out much.
Criminey, I was nearly 9 years past high school when that punk was born.
Brother Buzz
(38,270 posts)ProfessorGAC
(72,149 posts)Hardly any pitchers have CGs anymore, and a manager in a WS is thinking about when he'll need to use an ace again.
I'm with you. He isn't going to go all 9.
Brother Buzz
(38,270 posts)Who is the oldest professional pitcher to pitch a complete game?
Bonus Points: What is the connection between the pitcher's proclivity to smoke pot and the city he pitched the complete game in?
ProfessorGAC
(72,149 posts)I'm tempted to say Bill Lee, but that's just a wild guess.
Brother Buzz
(38,270 posts)Actually he broke his own record by doing it twice, the second one at age 65. He also played all nine positions, one each inning, another year.
420 is a clue on the bonus question
ProfessorGAC
(72,149 posts)The pot thing is what made me say him, but that was a lucky guess.
Pitching at 65! Impressive, indeed.
He couldn't have been shelled if he pitched all 9. He'd be too worn out!
I had a good arm as a kid. I can't throw it a third of what I could at 16. And, he pitched 9 innings at 65!!!
Brother Buzz
(38,270 posts)He grows, harvests, and ages baseball bat wood, and is plugged into an outfit that turns them (Fall River and Axis Bats). Most of his bats end up down in the islands (Cuba and others) where there is a dearth of good bats. He's as crazy as ever, and that's a good thing.