Adams has established himself as an elite safety in three NFL seasons, with two Pro Bowls and one All-Pro designation. Last season he had 75 tackles, 6.5 sacks and two touchdowns in 14 games. The newly acquired Seattle Seahawk turns 25 in October.
Andrews has become an elite receiving tight end in two NFL seasons and had a breakout 2019 season with 64 catches for 852 yards and 10 touchdowns en route to a Pro Bowl appearance. He turns 24 in September.
Baker has been an anchor in Arizona's secondary over three seasons, with two Pro Bowls. He had 147 tackles last season, including a league-high 104 solo tackles. Baker won't turn 25 until the 2020 regular season is scheduled to conclude.
Barkley burst onto the scene in his 2018 rookie season, winning Offensive Rookie of the Year and making the Pro Bowl with over 2,000 yards from scrimmage. He struggled through an ankle injury in his sophomore season but remains one of the most dynamic backs in football. Barkley is still just 23.
Brown's father was a dominant NFL lineman, and younger Orlando Brown is following in his large footsteps. The 2018 third-round pick started all 16 games for Baltimore in 2019, making his first Pro Bowl at age 23.
Like his father, former safety Devin Bush Sr., Bush Jr. has shown a nose for the football. He had a great rookie season for the Steelers with 109 tackles, two picks and four fumble recoveries at age 21.
Fitzpatrick was traded from Miami to Pittsburgh for a first-round pick last season but looked worthy of the price. The 23-year-old star was an All-Pro with 69 tackles, five interceptions, and three fumble recoveries.
Jackson now has a Heisman Trophy and NFL MVP to his name following his brilliant 2019 season. He led the league with 36 touchdowns passes and added over 1,200 yards rushing. The new "Madden" cover man doesn't turn 24 until January.
Mahomes signed a historic 10-year contract extension worth over $500 million this offseason, and his career is off to a historic pace. He won the MVP in his first season as a full-time starter in 2018, followed by a Super Bowl victory in 2019. Mahomes will turn 25 on Sept. 17.
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Christian McCaffrey, RB, Panthers
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The eighth overall pick in the 2017 draft, McCaffrey has improved significantly in each season. The 24-year-old was an All-Pro last year with a league-leading 2,392 yards from scrimmage and 19 touchdowns.
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D.J. Moore, WR, Panthers
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Moore is off to a great start to his career through two seasons. He missed out on the Pro Bowl last year but still had 87 receptions for 1,175 yards and four touchdowns. Moore turned 23 in April.
Murray was the 2018 Heisman Trophy winner at Oklahoma and added to his trophy case as the NFL Offensive Rookie of the Year in 2019. The former two-sport star threw for 3,722 yards and 20 touchdowns, adding 544 yards rushing and four scores as a rookie. He will turn 23 in August.
Two years into his career, Nelson is already known as arguably the most dominant guard in the NFL. The Notre Dame alum has been a Pro Bowler and All-Pro in both of his NFL seasons and turned 24 this offseason.
Watson is one of the NFL's young stars, making the Pro Bowl in back-to-back seasons and leading Houston to a 21-10 regular-season record over that time. He threw for over 3,800 yards and 26 touchdowns last season, adding seven rushing scores. Watson turns 25 after Week 1, on Sept. 14.
Seth Trachtman is a fantasy sports expert and diehard Kansas City Chiefs fan still hoping for a Super Bowl win during his lifetime. He doesn't often Tweet, but when he does, you can find him on Twitter @sethroto.