I just did my 4th out of 5 sets for the day, and today does not feel as good as yesterday, with a little bit of shoulder pain, but I will likely just continue to push through it and maybe i adjust a little bit by doing fewer pushups in each set, and for me I have quite a bit of a push-up surplus since I am averaging out my pushups and still generally increasing my quantity of push-ups per day.. at least for now.. and maybe there could be some days that I might perform below my average push-ups per day.. but my average push-ups per day is generally trending UPpity.
My training too hit a snag from last week and I completely stop, my shoulder is bothering me for quite sometime now that I can't ignored already. Take some pain killers but still it hurts, so I decided to go to chiro this Monday. No operations though, it could have been that I didn't do proper warm-up. Even if it is "just" push-up, at our age, we really need to stretch and pump blood on it and not directly go into the floor and perform it. Maybe when I was young and doing this, it's very easy. But at my age and sometimes experiencing frozen shoulder, I forget that my body is different now.
Sometimes the joints can take a while to build up, and they don't necessary build well when older and sometimes we develop conditions that limit how much stress or receptiveness we can do with some of our joints. It might not be clear if you have gone too far with it or not, and so that might be part of the justification to start out slow and to see how you feel the next day and if some parts continue to have pain, then to modify the exercise by quantity or frequency or even by difficulty level.. so yeah, I think that we would like everyone to stay in the game, but that would not be a good idea if actual injury is taking place.
I don't have a lot of faith in chiropractors, yet there may well be good ones out there that can help to consult with you about an appropriate level of exercise (pushups or modified pushups) that he might consider to be acceptable in order to help to build your shoulder. As another poster mentioned in this thread, I am not a BIG fan of overly babying ourselves, especially if our goal would be to build strength. .but there still is a balance in terms of not overdoing it.. if our body has to build up to it, if we are no longer in as great of condition as we might have been in our youth.