One of the many disadvantages of growing old is that you have seen more but are often too late to do much about it. You see more, not of course because of any innately superior faculty, but for no better reason than that you have lived through many changes and remember how things can be different, for better or worse, in a way which is hard to understand unless you experienced it. In the absence of experience, we rely on theory. For this reason, there are always campus Leninists, but very few survive into old age. Experience is a wise teacher, so long as you listen.
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