I would like to know whats up with that as well. Of the 4 or 5 security guards at my work, only one of them is somewhat young, and he is a solid 300 pounds (no offense to the vertically challenged) with a belt holding his radio and 8 bajillion keys. So at about 300 + 20lbs in keys, I don't think he could react any more swiftly than the older guys. I think one guy is even in his 70's. You don't exactly have to be a crazy ninja to get by these guys. Although at the same time, I work at a poultry processing plant, and I don't think too many ninja's want to get there hands on some chickens.........unless they're marinated with DIAMONDS or poop golden eggs.
Only thing I can figure is that these guys are all retired and looking for something to pass the time, and they will work for a low hourly pay.