Does it have to be a shotgun? If age and gender are a consideration, it seems that a shotgun might not be the right choice. I suggest something along the lines of a pistol caliber carbine. Or even better a pistol caliber pistol with a brace, like the new Ruger PC charger. Put a red dot on it and you have a light weight, high capacity, low recoil home defense gun that everyone can use. And it's threaded for a suppressor. And it takes Glock mags.