Cuts vs stabs is a good point.
I'll also bring up the age difference as a good defense. If the young guy keeps fighting, in general he'll get more and more of an advantage just from endurance capability (Again, in general. Lots of out of shape young guys).
I'll also bring up the old saw, "Never fight an old guy. We fight dirty and got nothin' to lose"
On the gun, Fresno is pretty much shall issue once you jump the state hoops. I think either they or kern county have the most ccws in the,state.