I'm 64, overweight, arthritic with a bad knee & back. I pulled up my pants for 25 years and carried what I wanted. Now, arthritic hands, light clothing and no butt limits what I'm willing & able to carry. A gun is a tool. A handgun is not really adequate, period. If a handgun is presented, the attacker will 1: stop or not. Nobody wants to get shot, even a little. 2: Handgun fires. Attacker stops or not. 3: Attacker hit one or more times, not in PHYSICAL or NEURAL stopping area (head, spine, hip or knee) then he will continue attack. Most GSW aren't fatal. Period. Best for me? 22 lr or 22 mag revolver (remember, bad hands) 10.5 oz S&W 317 (8×22lr) or 351PD (7×22mag). I try to avoid bad areas, maintain situational awareness and carry even in my living room. I also have a range at home & shoot weekly with 3 or 4 friends. I can still keep all rounds on a playing card DA from 10 yds. All on a USPSA target rapid fire without sights @ 7 yds. You work with the tools you have, optiomise your skills & hope for the best. If you shoot them & they don't stop, caliber won't be the problem. Carried for 40 years & almost needed it three times. A handgun can change you perception. Holding a gun in your hand in your pocket allows you to control your fear and in my case the situation enough to escape the situation. Actuality showing a gun is sometimes enough. This "enough gun" has and will continue forever. It all starts with RULE NUMBER ONE: have a gun, then work on the rest and hope you don't need it.