Congrats on 61, but that arm looks like oil to me. Delt is rather small compared to that arm.
Hey, sorry but I forgot to wish you a HAPPY BIRTHDAY!! Like you, I think staying injury free is the real secret to longevity. Over the years I've learned to listen to my body and to train around any areas that get painful. For instance heavy presses, barbell and dumbell which used to be my favorite delt exercises are now a thing of the past, so I have to attack them with lighter, less dangerous choices like lateral raises. Don't have the size I used to on my delts but their shape is still not too bad. By the way, that pic of my arm is right after my morning arm workout which means that it is with about a 1 inch pump.
Again congrats on your birthday and never stop lifting, got to keep those younger guys on their toes.
your brother in Christ,
Lucky