Chasing Peyton: Where active quarterbacks rank behind Manning on all-time TD list

Manning set the touchdown record on October 19, 2014 with four touchdown passes against the San Francisco 49ers, passing Brett Favre's record of 508.

Perhaps the only quarterback with a legitimate chance to pass Manning within the next decade, Brees has posted three straight seasons of 39 or more passing touchdowns in the Saints high-powered offence.  Working against Brees is his age - Brees is just three younger than Manning - and his slow start to the 2014 season, Brees is on pace for 33 touchdowns this season, which would be his lowest total since 2010.

At the age of 37, Tom Brady is unlikely to provide competition for Manning's record. Brady has not posted a 40-touchdown season since his record-setting 50 touchdowns in 2007, and is unlikely to do so this year. Brady will, however, likely pass Dan Marino's 420 passing touchdown mark before his career is over.

Considering he didn't start for three seasons after being drafted in the first round, Aaron Rodgers has scored touchdowns at a torrid pace. In his first seven seasons as the Packers quarterback, Rodgers threw 188 touchdown passes, an average of 26 per season despite missing half of the 2013 campaign. Rodgers is once again on pace for 40-touchdown season in 2014 and if the quarterback can sustain his health through the age 40 or more, he could challenge Peyton.

Matt Stafford battled injuries throughout his first two NFL seasons, but has since started every game through his past three seasons. Earning his start at age 21 has given Stafford a jump on the field of Luck, Newton and Wilson. Considering his age and current mark, Stafford is probably the most likely active player to catch Peyton's final record first.

It seems only right that Manning's successor in Indianapolis could be the next to set the touchdown mark. After posting 23 touchdowns in each of his first two NFL seasons, Luck has thrown 19 TDs through seven games in 2014 and appears to be ready to challenge the NFL's elite. Though the future remains unpredictable, if Luck maintains his 43-touchdown pace for this season and consistently posts 30 or more touchdowns a year moving forward, Luck could reach Manning by the time or before he hits the record holder's age at 38.

Newton has a far way to go but his 72 touchdowns since entering the league in 2011 is a strong start. However, durability concerns and working in an offence with less passing weapons than Luck could see Newton passed by another young quarterback. 

Though Wilson is almost even with Luck in touchdowns, the 2012 third-round pick should be viewed as less likely to reach Manning than the Colts quarterback. Wilson is one year older than Luck and currently operates in a run-first offence.

At age 32, Eli Manning is unlikely to challenge his brother's mark. Eli has also posted just one 30-touchdown season in his career.

Philip Rivers has thrown at least 26 touchdowns in every season since 2008, yet like many others Rivers' age works against him. He also sat behind Brees for two seasons before earning his first start in San Diego. 

With Aaron Rodgers quickly gaining ground and several injury riddled seasons in his past, Roethlisberger should be considered a long shot to reach Manning.