After 65 years I have come to believe that "grumpiness" among, um, experienced people, is often the result of that experience. We've simply seen so many people not doing their job competently that, unfortunately, we come to expect it. And, given that our personal time has become our most valuable asset, we feel no need to waste a moment on incompetents. But we must, on occasion, interact with them. That is easily (and often reasonably) interpreted as "grumpy". I sense a certain tendency to this in you.....
Yes, everybody gets grumpy when they don't feel well -- but that happens at any age.
I personally do my best to forget my "birthday", so I can't, without substantial hypocrisy, wish you "happy".
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