The greatest game I have seen has to be Madden 2000 for Nintendo 64. For Nintendo 64 Madden Football for the Nintendo 64 is one of the best designed football games ever made. The most important part, is game play and Maddens got it, and this one is about as real as they come. If you throw the bomb 10 times in a row, most passes will land incomplete and the ones that don't might just be interceptions. The Franchise mode is the best option on a football simulation I have ever seen.
Players get older, and as they age they get better or worse.
A veteran receiver might start to lose a little speed as he gets older.