What should an athletic 16 year old male about six foot three, that weighs about 160 pounds bench press.
Well, the answer can be subjective since not every one is the same. Generally speaking, you should be able to bench press your own body weight for reps. The build of your physique does affect your bench press as well. For example, a tall lanky guy with longer arms is somewhat at a disadvantage in comparison to a shorty stocky guy with short arms who's range of motion is naturally less.
75% of his weight this applies to all men below age 20