Its crazy. Especially someone like Doc who many thought could pitch well into his late 30's and dominate the NL which he did during his first two seasons. Even could throw Brandon Webb and Tim Lincecum on that list. We're starting to see it with guys like Wainwright, King Felix, Arrieta, and others.
It's kind of scary when you think of it. It would suck if lets say someone like Max Scherzer or Kershaw went down in the next year or two. That's why as a fan anytime you could watch someone like Kershaw, Scherzer, Sale, King Felix (in his prime), Tim Lincecum (his good years), Doc (when he was healthy) etc., you have to appreciate that moment because you might not see that elite level of performance from them in the next 2-3 years.