2020 Age: 31
Andrew Luck doesn't have the NFL's strongest arm, but he has more than enough arm to make every throw you'd ever want—and he can make them on the run to his left or right while adjusting his arm angle to make the pass. Luck also understands touch in ways few quarterbacks ever have. Put that all together, and you have an elite NFL arm.
Anticipation and ball placement make Luck great, but he has room to improve in terms of decision-making and timing as a passer. In this way, Luck is more John Elway than Peyton Manning, but as he heads into the next phase of his career, this will make or break his potential stardom. Luck has the tools to be great, but he must be better than his 2015 film showed.
A talented runner, Luck has the body type (6'4", 240 lbs) and athleticism to make plays in space. Moving ahead and looking long-term, the biggest concern is Luck protecting his body over picking up a few yards on runs.
At just 26 years old in late 2015, Luck is still learning how to be an NFL quarterback, and his upside is unrivaled. Even looking ahead to 2020, Luck will just be entering his peak quarterback years. The fact that he missed half the 2015 season with injury does creep in as a concern, but unless he comes back in 2016 looking far less talented, Luck's upside is still a huge positive.
Luck is already the best young quarterback in the game, and five seasons from now he'll be the uncontested best in the business. The heady franchise quarterback is the perfect combination of brains and brawn, and he's only improving in terms of mechanics, anticipation and ball protection. In 2020, we will be talking about Luck as an all-time great.