I've got a couple of years on you and also am a Vietnam era Marine that no longer runs in the mean streets of my youth. But I have found that in today's World the mean streets can come to you unexpectedly and without warning.
I consider lawful concealed carry to be a commitment that goes beyond personal protection. Today I carry to create a sphere of protection for those everyday citizens around me. I don't go looking for trouble, but my life experience tells me that trouble can find you.
A close call, and wakeup call, came a few years ago when my wife and I had a brush with a deranged mass murderer who went on a racially motivated killing spree who picked a Chinese restaurant we frequent for his murderous rampage.
We arrived to have lunch just moments after he left, smoking gun in hand, missing his departure but just a couple of minutes. While we were not of the ethnic minorities that he targeted, if we had not been delayed by happenstance, we most likely would have been walking in as he came out. It was a close call to what could have been a deadly encounter for us, as it was for the two people inside that he murdered.
That single event is what led to my getting a CC permit and a renewal of awareness that it is within the realm of possibility to encounter a deadly threat, no matter how sedentary a life we lead as senior citizens.
So by all means carry what you can and train with it to become proficient with your weapon of choice. The life you save may not even be your own. As a Marine your oath to defend America and it's people has not expired.
Semper Fi,
digiroc
Richard Baumhammers - Wikipedia