And for those that said pistol grip shotgun, slap yourselves

Why??

small lightweight, ease of operation. i suggested a .410 not 12ga. the 410 pistol grip is very managable for anyone, especially with a weak grip or unable to support a heavier firearm.
any kind of centerfire revolver is
1) waste of money
2) putting the operator in harms way
3) still too heavy for an older inexperienced person.