congratulations on a legendary career, Jason Kelce!Jill Biden is among the Philadelphia Eagles superfans praising Jason Kelce on his retirement announcement.”Congratulations on a legendary career,” the first lady wrote in a Monday social media post.Biden’s joyful tweet came just hours after a teary-eyed Kelce announced his NFL retirement at a press conference. The 36-year-old Super Bowl LII champion spent his whole 13-year career with the Eagles.“I have been the underdog my entire career,” Kelce stated during his announcement. “And I mean it when I say it: I wish I still was.”Biden, who grew up in the Philadelphia suburbs, is an avid Eagles fan.Last year, the first lady wore a bespoke Eagles jersey as her hometown club prepared to meet the Kansas City Chiefs in the Super Bowl.