Age, author Mark Twain is known to have stated, is an issue of mind over matter, and if you don’t mind, it doesn’t matter. Try telling that to senior citizens, especially the ones who are not so comfortably retired for various reasons, and more often than not, you will get a sharp retort. Superannuated seniors do mind. A medley of irritants perturbs them all the time, some of these upend the most well-laid retirement plans.