Pitching - 3. Justin Verlander, Charlie Morton, Kyle Gibson.
Hitting - 0.
Now, how many SP were in the top 40 at age 31+ other than those 3? 8, 3 of which turned 35 at the end of the season. Pitchers are in decline in their mid 20's. So at 30-35 there's not some gigantic chasm of success vs failure.
If the gap isn't big in the ages we are talking about and the injury risk is random, why saddle yourself to a 5+ year deal vs a 2 year deal?
You aren't making a compelling argument to avoid a 34/35 year old pitcher on a shorter deal, especially when the pitchers we are talking about are damn near identical statistically.