its a fair enough assumption. I cant remember which manager said it, possibly Paisley or Stein, but they reckoned most players had about 500 games in them . after that it was a steep decline. Obviously there are exceptions to that rule, but in terms of total club football, Gerrard played 504, Hansen 520, Dalglish 559, Souness 539, Ian Rush played 600, but in his last 70 club games only managed 4 goals. Milner currently has about 520 club games in the tank.