Some good points posted about getting older and fighting. As you get older you just have to walk away, unless you get pushed into a corner so to speak. Then you have to defend yourself as best as you can.
Thought I'd share this story about my late Dad who took on a younger guy maybe 20 years ago in Florida. A story I'll always remember.
My younger brother was roommates with a few other guys into drugs, my brother included. My brother called my Dad asking him to come pick him up because these guys were going to do some drugs by putting needles in their eyes. Yup, pretty messed up but when you are a drug addict... My Dad told me later that he almost didn't answer the phone and go but, it was his son so he went. He decided to take my grandfather's old cane with him instead of his pistol which was a good decision.
After getting there, one of the guy started to give my Dad some crap and threatened him. My Dad said he hit the guy in the stomach with the cane, the guy dropped immediately and started crying. By this time someone had called the cops.
My Dad told me the cop said "You threw the cane at him, right? You didn't hit him with it, right?". Dad agreed that is what happened even though it wasn't really true. As my Dad and brother were leaving, the cop took my Dad aside and told him he was letting this slide this time and not to do that again or he'd be charged. Glad the cop was a good guy and understood the situation.
And...my Dad was 75 years old when this happened. My brother's roommates were in their 20s and early 30s. I'm sure that one roommate who threatened my Dad probably thought Dad was just some old guy. Boy was he wrong! Dad was a tough guy, retired steel worker. He never looked for trouble and would rather just walk away. But, mess with his family and you'd be in a world of hurt.