How much does age matter when drafting a QB?

[THE PISTONS]

(10-20-2019, 10:59 AM)Bengalbug Wrote: Rodgers was 25 when he started

Palmer was drafted as a rookie his age 24 season and was 25 years old the end of his first year starting

Rodgers was apparently 21 when drafted. He's actually the highest rated example:

The six signal callers age 21 and younger by September of their draft year have by far the greatest average value, at 75. And it’s not just Aaron Rodgers, who has posted a 128 career approximate value. Alex Smith (93 CarAV), Matthew Stafford (85) and the retired Michael Vick (93) were also successful picks at this age. This would be good news for the team that this year took the youngest of the highly drafted passers, the Jets with soon-to-be-21-year-old Sam Darnold. The returns diminish dramatically with the 10 QBs at age 22, even though they were drafted higher on average (seventh versus ninth). And the bust rate (players with a CarAV below 40) increases from 33 percent to 50 percent. Likewise, 11 of the 18 picks (61 percent) at age 23 were busts. This age 23 group houses some of the most notorious draft disasters in this time period: Tim Tebow, Christian Ponder and Jake Locker were all 23 by Sept. 1 of their draft year. Locker, drafted No. 8 overall in 2011, was so tired of football that he walked away from the game at age 26.