How many pitchers have made it halfway to 300 by their 30th birthday?  Using B-ref's PI you can get an idea.  Go to the Pitching Season Finder, and set the following guidelines:

- In the top yellow bar, click off on this option: Find Totals for Matching Seasons or Careers

- In the left column, where it gives you an age option, choice "Any" as your start, and "29" as the finish.  This isn't perfect, but if you can run it once at 29 wins, and again at 30, and check the gamelogs here or at retrosheet (for pre-1957 it would have to be at retrosheet) to see when the guys on the border won #150.

- In the right column, set for Wins, equal to or more than 150 wins.

These are the liveballers who won 150 before their age 30 season.   If you check the gamelogs, you'll see Clemens won his 150th shortly after his 30th birthday.  The rest all won 150 while in their 20s.  The other 16 make up the complete list of liveballers who won 150 before turning 30.  Only one made it to 300.  Hell, they combined for four 20 win seasons after turning 30 (3 by Palmer, one by Feller).  Winning that many games that young isn't good for the arm.

Here's the winningest liveball pitchers by the end of their age 30 season.

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