As we get older that realization hits all of us. I've had back pain for 30 years. Early on I could just push through it. At some point I had to get honest with myself and that there's just stuff I can't do anymore and I have to ask for help which I used to never do. I've found that to be more common with other aspects of my life. I've just come to accept I'm not near the man I used to be physically or even mentally.
Well great, I have physical decline to look forward too as well. Just when I was working on being able to do handstand pushups again (its been 20 years). I am actually close, but I probably need to drop down to at least 250 before I am successful.
I did decide against getting back into playing lacrosse... I remember playing pickup games with older guys when I was in college. One time a guy looked at me and said "dont hit me, I have to work on monday". That resonates now.