For some reason, my comment seems to have come across to you with an unintended tone. I was only trying to gently urge you to consider that even the relatively old have some years of life left and we draw the line at different places for different things. For instance, at that age, it is practically impossible that someone can start studying medicine and become a surgeon. In the places where I have lived, there is a small window of time in one's youth where one can study to become a doctor. So, in those societies, they drew a line in a way where for some professions, they did indeed delineate like you suggest. However, in many places the Ph.D doesn't fall on the side of the line where you prefer. However, it is ultimately, just that people draw the line at different places and there will be no decision that will keep everyone happy. So, in this case, perhaps you and I can not come to an agreement given the brief exchange we have had. And with that, mate, I wish you a good day.