Tom Brady is starting to feel old.

The Patriots quarterback has been limited in three of the last four practices because of a calf issue, and him being 42 years old is a factor.

“Football is a contact sport. I wouldn’t say I’m a spring chicken anymore,” Brady told reporters with a smile Wednesday. “I’m trying to just feel as great as I can and we’ll see how it goes tomorrow. But I feel pretty good.”

The six-time Super Bowl champion returned to full practice this past Friday prior to New England’s 30-14 win over the Jets on Sunday. Brady certainly didn’t look to be aging in his Week 3 performance, completing 28 of 42 attempts for 306 passing yards and two touchdowns.

Brady is still likely to play against the Bills this Sunday for the AFC East matchup between two undefeated teams. But it’s allowed recently signed quarterback Cody Kessler to get a few extra snaps, which coincides with head coach Bill Belichick’s “roster management” plan he mentioned in regard to the team signing the free agent on Wednesday.

Kessler, who started four games for the Jaguars last season, was brought on following rookie Jarrett Stidham’s pick-six during his first appearance of the regular season Sunday.

Brady had plenty of company in the limited group, joining wide receiver Julian Edelman (chest) and eight other players.