Peyton Manning isn't used to early exits.
The Indianapolis Colts lost to the New York Jets 17-16 in an AFC Wild Card game on Saturday. Despite the first round loss, Manning still finished with another incredible season as he completed 66 percent of his passes for a career-high 4,700 yards and 33 touchdowns.
He finished the regular season tied for first in the NFL in yards per game (294), second in passing yards, second in completion percentage (66.3) and had the 10th-best quarterback rating (91.9).
On numbers alone, you can't question Manning's ability. Arguing that for a second would be stupid. But he's also getting older, and his window of opportunity for more Super Bowls is narrowing. Look at his games, and he still seems to be in his prime, but look at the big picture and you'll see the clock is ticking.
Here are 10 reasons why Manning's career could be headed downhill: