ARLINGTON, Texas — Since he was called up May 30, Endy Chavez has played in 71 of the Mariners’ 86 games. That’s not a ridiculous amount of playing time for an average player. But Chavez is no longer an average player, at least in terms of age. At 37, that’s a lot of games and a lot of wear and tear on a body that’s played 1,142 big-league games over a 13-year career.