Injuries are a different case. I'm in the same set as you, and my father as well. As long as he and I do ~20 pushups per day and maintain a bit of focus on impr

Injuries are a different case. I'm in the same set as you, and my father as well. As long as he and I do ~20 pushups per day and maintain a bit of focus on improving/maintaining our posture during various activities - backpain is negligible. But neither of us have ever needed to take pain medication for back pain. A lot of the people I've known over the years who took opiate painkillers for back pain have had injuries to their spine. Some people I know with spinal injuries tried opiate painkillers, found that they were effective for the pain, but the side effects prevented them from being focused at work, so they chose to live with the pain in exchange for mental acuity. I also know others who have tried very high doses of opiates and it did not significantly reduce the pain from their back injuries.