It happens to all NBA players, father time catches up one way or the other. Older players eventually aren’t able to play at the same level they did in previous seasons. Sometimes it has to due with one significant injury or maybe just the wear and tear of NBA seasons finally breaking a player down. The latter has seemed to happen with Philadelphia 76ers big man Amir Johnson.
Looking at Johnson’s stats from last season to this season, they don’t scream decline, in some areas it may appear that he has improved his play such as points per game and field goal percentage.