The victim is old enough that the penalty will be tougher. Hopefully jail time!
I would hope 10 years minimum with a 7 year possible parole hearing unless he had previous violent priors. In that case make it 30 years with a 29 year possible parole hearing.
Then put this on all media broadcasts to make sure the thugs know there's a steep price to pay for picking on old or disable people. If the guy was under 55 and healthy; make the penalties half of what I listed. That's still a wake up call to these thugs. Of course if they had any smarts they wouldn't be dong things like this in the first place.
Good argument for stand your ground laws and concealed carry. Young punk goes after old or disabled person like that; it should be perfectly legal put a bullet through the brain of the punk.