<prompt> Human: I have a co-worker that is 76 and hes not very good at his job. The boss wanted to fire him a few years ago but he was 2 years from locking in a small pension and I convinced the boss to let him stay on until he reached that point. He drops the ball a lot, and it messes stuff up for everyone, misses key deadlines, etc. I end up doing a lot of his work to take the heat off him and its easier to do it right the first time than it is to fix it after he messes up.So now that hes reached a point where he can retire, I asked him if he plans to retire and he says he wants to stay on as long as he can. At this point I feel a little frustrated. Im tempted to stop doing his work for him and let all hell break loose. I know some occupations have mandatory retirement ages for Judges and Air Traffic controllers. Is their a point where normal folks must retire?  <response>: No. 