This is by far the youngest Opening Day roster coach Bill Belichick has assembled with the Patriots. The average age of New England’s roster right now (the team could have added four more tight ends late Sunday night) is 25 years, 274 days, according to STATS, LLC. That’s more than a year younger than the 2010 squad (26-280). The third-youngest team was Belichick’s first, the 5-11 juggernauts of 2000 (26-329). Where the youth really shows up is on defense. The average age of the starters is 25. The only other Belichick team to be under 27 was the ’10 version at 25.1, according to numbers from Pro-Football-Reference.com.