Okay pal, time for a little heads up reality info:
First of all if you are Bench Pressing at the age of 36 you are asking for shoulder problems. Bench Pressing is not a good movement unless you are built for it (big chest short arms).
Ditch it, you don't need it.
Do Dumbbell Bench Pressing or Push-ups with feet elevated or with weightd for chest.
Secondly, if you don't take the proper supplements you are a huge train wreck waiting to happen.
I'll give you my list you can google each to see what it does for you:
Glucosamine (1,500 mg)
MSM (300 mg)
Boswella Extract (1000 mg)
Wobenzym (12 caplets)
Fish Oil (No less than 4 grams per day)
A top notch Green Drink. I like Green Magma but there are many good ones available.
In addition to this make sure you take a good multi vitamin. I like Twin Lab or Life Extension.
Thirdly, you need some serious active recovery.
I get a massage once per week. Yea, it's expensive, but training is a priority so I spend the money.
I get in a cool pool three times per week. And a hot tub three times per week. It's time consuming but I do it anyway.
I make sure that I get no less than 8 hours of sleep a night. This is a BIGGIE! Don't underestimate the power of sleep to heal your body and mind.
I'm 49 and I've never been stronger and in better shape. If I get an injury I work around it and do everything I can to heal the injured area. And I don't let it get me down emotionally. There are many people who would like to see you fail at whatever you are doing. They are negative, nasty and for the most part never did anything with their own body. Don't you join them by getting down on yourself!
Smile man....life is good!
Finally, as I get older I get just a tad smarter so that makes up for an aging body, at least in part.
Don't quit you have many more good years of training ahead of you, if you do all of the above .....and more.
Like I told my wife just last night: They are going to have to carry me out of the Gym...
I'm going to lift heavy, hard and often. And I'm going to run, bike, swim and continue to do all of the things that got me where I am today!
I'm not giving up EVER!
You do the same!
Best Of Luck,