Again, the point is not talent. The meaningful bit is that the complexities of the QB position have increased to such a degree that we're no longer comparing apples to apples.
You could not have picked a better list for me to illustrate my point. On that list the second youngest guy is Brett Favre. Despite being pond scum as a human being, Favre played a vital role in the evolution of a play that's been run for decades. The full story seems to only exist in archives at this point, but here's a link to the evolution of the Mills play, as coined by Steve Spurrier. To this day, it's the best sports piece I've ever read:
The long and the short of it is that current QBs have wildly different demands today
even while running plays that have been around for decades.