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Having good cause to do so, I poked around about pitchers winning the Cy before age 25.
Amazingly, in 1985 Gooden won the NL Cy at 20 and Saberhagen won the AL Cy at 21!
Then Clemens won in '86 at 23.
Then Lincecum last year at 24 (and he's on his way to back-to-back). I didn't go back farther than Gooden.
Felix is pulling away from Grienke and the Ms ought to finish with more wins than Toronto, so I would see it as between Felix and Beckett.
The combo of Boston glamour and having a longer career without a Cy makes me think Beckett would win today, but Felix looks to have a better ERA and more Ks.