I'm 14, 5'11 and weigh 152, max press 165. Pushups are good for improving your max, but in the end, they do not help too much as they are such a low weight. To increase you max bench you have to do just that: Bench. A good bit. Start with something you can rep about 10 times and then switch it up a little, you know do one day heavier weight and another lighter weights. If you continue this you will see your max shoot up maybe by ever 100 pounds in the next year.
Why are you concerned the 'average' bench for a 14 year old? Are you looking to be average? Look around. Every 14 year old is different; I know - I'm an 8th grade teacher. Don't compare yourself to others.
Now, if you want to improve your bench, forget pushups. Sure, they're great for a bodyweight exercise and for warm-up/cool-down purposes. However, if you want your numbers to go up, then you need to lift more weight during your training sessions. If 85 is your 1RM now, don't try 'maxing out' (I hate that terminology) for about 2 more months. Increase the number of sets you perform and decrease the reps. Keep your reps on multi-joint movement exercises at 15, 12, 10, 8, 6. At your age, you don't need to worry about doing anything crazy. Keep it simple and eat right to fuel your body. You'll see results soon.
"I've up-ed my intensity.... now up yours!"
"Pain is only weakness leaving the body."
"Never think of how weak you are; think of how strong you're going to be."
im 5'6 weigh 145 im a running back in highschool and i can max out at 225 i agree with everybody to forget the pushups i got my max up so high by benching 20 reps of 95 15 of 115 10 of 135 5 of 185 and 1 at 205 then i went back back down like a pyramid i saw results very fast and im up to
im 5'6 and abot 120 my max is 140 and about ten reps of 125. its not realy how big you are just how long you have lifted i strted 3 months ago lifting 90x10 and weighing 110 now gained 10 pounds and can lift a lot beter. it is also in your form beter form beter results.