you divorce your wife after 40 years of marriage

Cheesy, I'm neither grumpy, nor rude. I think that ,when you're old, you are still who you were when you were young. I know you've met rude young people. They will be rude old people. I am willing to bet you have met lots of young people who are miserable most of the time. They will be grumpy when they get old. Those nice, cheerful, helpful young people you know, will be the same when they are old. We don't suddenly become someone else when we get old. The only thing that can make a very pleasant old person really grumpy is young people who treat us as if we must all be the same because we are old.

I promise. Not to expect rudeness or ignorance from you because you're young, if you will do me the same courtesy.