My first impression was that QBs who seek that last roar of the crowd, that last hoorah have failed and disappointed more often than not. I thought of Joe Montana as the exception when he came close to the glory of a career capping Super Bowl appearance with Kansas City in 1994. He did manage two years of providing seasons of thrills and playoff chills.
My actual memory of QBs who have tried to continue careers when the end was near includes more "Blah" than "Rah".
Johnny Unitas (Age 40) tried for continued glory with the Chargers in 1973 but all he succeeded in doing was to embarrass himself. Joe Namath (Age 34 but with knees age 54) tried to relive the glory days for The L.A. Rams in 1977 but glory proved a distant memory far from NY. Warren Moon (Age 44) was game for the chance in 1999 to 2000 for K.C. but he hardly sniffed the field.
However.... more to the story...
The knee-jerk reaction to the Manning Story was "Been there-Done that". The old guy just won’t cut it. A little more research shows that there have been more "Rahs" than "Blahs" when it comes to old QBs not wanting to hang up the old cleats.
Bobby Layne (Age 36 at the end) was traded to the Steelers by the Lions and did OK from 1958 to 1962. He brought some remaining talent and was vested as a kind of "Player Coach" and helped lead the Steelers to some of the finest seasons they had experienced as a franchise up to that time.
After a strong career Y. A. Tittle (Age 37 at the end) played his last four years with the N. Y. Giants and capped his stellar career leading them to three Divisional titles in 1961, 1962 and 1963. These were the Giant’s heydays at that time.
Norm Van Brocklin (Age 36 at the end) had a storied career but topped it off as a Player Coach in 1958-60 with Philadelphia as he led them to a Championship in 1960.
We know that Joe Montana did OK with the Chiefs and was more of a contributor here than he would have been in San Francisco as another Great QB needed the playing time.
I have only included modern-era Hall of Fame QBs who have had solid careers with a brief end elsewhere from whence they came. But it seems evident to me that Peyton Manning (Now age 35) is worthy of a "Last Hoorah" and if given the chance has a 50-50 chance of hearing more "Rahs" than "Blahs".