Yeah but there's still no way 4/4 players over 35 are all going to defy the age curve and stay at an elite level regardless of their talent, drive and conditioning. Sure, Nola and Wheeler could end up matching Verlander or Charlie Morton but both of those guys have also had an injury year (Morton's just happened to be when he was 32 and a Phillies player). Halladay and Lee were done at 35 (though Roy pitched one more season).
And Harper is already less valuable than he was two years ago (fielding positional downgrade, hasn't played a full season), while Turner is heading that way in the field at least (whether he does or doesn't stay at SS). Andrew McCutchen was no less of a high-character physical specimen. Joey Votto neither. You hope they stay useful and sneak in a couple of unexpectedly good years.
But it's okay! The players all deserve it (because they are underpaid earlier in their careers in what is still a flawed system), Middleton can afford it, and I'd rather have Nola and Wheeler (both as fan favorites and as players) than new free agents who would still cost just as much, even if they'd be younger in their out years (they still wouldn't be young, which is why the Phillies and everyone else also preferred Yamamoto to the others).