I am 42 and I cant remember the last time I wasn't in pain somewhere. 2 years of chronic groin pain that I am able to train through and improve, but I have not been able to play a sport or any other activity (even bowling hurts like hell). The worst part is this pain gets worse when I return from extended rest, which I have had to do for various other injuries such as hamstring injuries. I probably would need to take 6 months off for this groin pain to go away, but I am not willing.
Back to your topic, my groin pain is always way worse in the morning or after prolonged sitting and is remarkably responsive to NSAIDs. Just 400 mg Motrin nearly clears the pain for 12 hours. I don't wake in pain if I take the night before- but I use sparingly (once a week) as we all know that NSAIDs lose their effectiveness if taken too often.