No more whispering or wondering.

This is Peyton Manning’s sun-setting season.

It will end triumphantly in 105 days at Super Bowl 50, or in disappointment on that February Sunday night, or perhaps, alas, before.

So, savor, and appreciate, his last ride.

Many years ago I saw Sinatra perform in Las Vegas. His voice wasn’t as strong, silky-smooth or stretched as it once had been. The melodies seemed smokier, subdued and softer. But he still remained the Chairman of the Board.

Like Sinatra, Manning, even in the twilight of his career, is an eminent entertainer.

This Sunday is Peyton’s final regular-season bye until the goodbye.

Rather than be on his back, people should have his back.

When all is considered, this could be not Peyton’s worst, but, rather, his greatest season. He has aged in football years visibly; his skills are diminished; his hand is “tingly” from damaged nerves, and his arm and legs are weaker; defenses are wiser to what he no longer can do; he has been forced into a new system mostly unsuitable; he has not been aided by a forceful running game or a stalwart, cohesive offensive line; his tight ends and slot receivers are nonexistent; and Manning’s mental mistakes have been magnified.

Yet, he has been provided with the most extraordinary defense of his 17 seasons on the field in the NFL; he has a coaching staff striving to adjust to his needs; and the other players are doing their best to make the most of their quarterback’s last hurrah.

Peyton said after the victory at Cleveland that he wouldn’t be going to Las Vegas during the off week because of his unluckiness. Wrong. The Broncos are lucky to be 6-0. They could be 5-1, 3-3 or even 2-4.

Phillips’ Screwdrivers have been amazing, astonishing and astounding — interceptions, fumble recoveries, sacks, stops.

And in defense of Manning, he has been remarkable when it matters.

Consider:

The 75-yard pass play with Emmanuel Sanders at Cleveland and the 72-drive in overtime for a field goal. Manning has an NFL-record 56 game-winning drives — including three in 2015.

The two touchdown passes before halftime in Kansas City to tie the game, and a 80-yard drive to tie it again — before the victory.

Long throws to Demaryius Thomas and Sanders to help propel Denver in Detroit.

The fourth-down, 1-yard touchdown pass to Owen Daniels in the victory over Minnesota, and another late drive for the go-ahead field goal.

He isn’t the Manning of old, but the old Manning isn’t finished.

Peyton has two more NFL records just ahead.

He will tie Brett Favre’s record for most career regular-season victories by a quarterback, 186, with the next. And the Broncos play Favre’s former team, Green Bay, next Sunday. Peyton might break the record against his own former team, Indianapolis.

Already this year, Peyton has surpassed Favre’s record for combined regular-season and postseason passing yards, and, with 71,215, Manning is 624 yards from breaking Favre’s regular-season career passing yardage mark of 71,838. That record is forthcoming probably at home against Kansas City on Nov. 15.

“Peyton has a few things left to accomplish” before he retires, his father, Archie, told me recently.

Those are two to add to the two dozen he already owns.

And there is, of course, a fourth Super Bowl to play in and second to win.

Although Peyton contemplated retirement after last season, he ultimately decided to return. He has said this season he is not thinking about retirement. But he knows the end is near.

As Manning walked victoriously out of Arrowhead Stadium, and then the Coliseum in Oakland, he realized he wasn’t going back.

He will have one, probably two, more memorable duels with Tom Brady, who is talking about playing another 10 years.

Thusly, those who have had the grand opportunity to watch Peyton in Denver should be enjoying this season instead of lambasting him or demanding that he be replaced by an unknown quality.

Nobody criticized Frank Sinatra at the conclusion because he wasn’t a young crooner or made him do rock ‘n’ roll. They sat back and enjoyed “My Way.”

Gary Kubiak should let Peyton Manning play in the shotgun and run the offense his way. He has earned the right.

And we should sit back and enjoy the song of the swan.

Woody Paige: woody@woodypaige.com or @woodypaige