Comment: Yes indeed, those 70 plus year old guys are a real danger.  You need to grab them firmly, pull their hair and, if needed, dislocate or damage their shoulder joint.  Gotta show those geezers who's boss here! 

To be sure, working as a guard in the jail wouldn't be a whole lot of fun.  However, mistreatment of inmates is not, to my knowledge, included in the job description.