Top 10 Youngest MLB Rosters For 2025 Season

Editor’s Note: This story updated March 26, 2025

With the regular season starting in full on Friday, BetVirginia.com was curious which teams have the youngest rosters in the MLB for Opening Day. Using the 26-man rosters on FanGraphs.com, we updated and calculated the average age for each team and ranked the top 10 youngest teams, as part of our Virginia sports betting coverage.

Rank	Team	Total Score
1	Miami Marlins	27.57
2	Tampa Bay Rays	27.63
3	Washington Nationals	27.96
4	Cleveland Guardians	28.11
5	Athletics	28.52
6	St. Louis Cardinals	28.56
7	Detroit Tigers	28.70
8	Milwaukee Brewers	28.72
9	Chicago White Sox	28.81
10	Colorado Rockies	28.98

The Nationals made the most of their last trek to the playoffs in 2019, winning the club’s lone World Series championship in 2019 over the Houston Astros.

This year, Caesars Virginia Sportsbook gives Washington the second-longest odds of any team at winning the NL East, at +8000, ranking ahead of the miserable Marlins, who are listed at +25000 as of March 26.

The operator also has +8500 odds on Washington to win the NL pennant and a +15000 line on the franchise winning the second World Series championship, joining that memorable run in 2019.

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Nationals Among MLB’s Youngest Teams in 2025

Of the 30 teams that call the MLB home, the Nationals total score of 28.20 years relating to the team’s collective age puts Washington as the third youngest team in The Show. We’ll see if the team’s youth is a positive or negative for Washington Nationals odds in 2025.

Washington is only behind the Miami Marlins (average age 27.57 years) and Tampa Bay Rays (27.63 years) and just ahead of the fourth-place Cleveland Guardians (28.11 average age), according to the stats at FanGraphs.com as of March 26.

Leaguewide, the Nats also finished ahead of the Athletics (28.52), St. Louis Cardinals (28.56), Detroit Tigers (28.70), Milwaukee Brewers (28.72), Chicago White Sox (28.81) and Colorado Rockies, who rounded out the list of the 10 youngest teams in the league this year at an average age of 28.98 years.

In the Nation’s Capital, Washington’s last two seasons have ended in dueling 71-91 (.438) finishes, as any futures bets on postseason glory for the Nationals have come up empty for optimistic backers at Virginia sportsbook apps.

But the stage could be set for the Nationals to return to the sport’s postseason in 2025.

For manager Dave Martinez and the Nationals, 2025 is a year brimming with potential and promise, as Washington gets to see how the team’s cadre of rising stars fare in the Big Leagues after years of promise in the minors. These younger players on the Nations are getting a shot to show what they can do after years of watching from afar.

Washington has a preseason win total over/under of 72.5 and +850 odds of reaching the playoffs, per DraftKings Sportsbook Virginia, so they’re still considered a longshot.

USA Today photo by James A. Pittman

Author

Christopher Boan

Christopher Boan has been covering sports and sports betting for more than seven years, including stops at ArizonaSports.com, the Tucson Weekly and the Green Valley News.