Mr. Rosenblatt is the author of “More Rules for Aging,” from which this essay was adapted.

This is a list of rules for the elderly, the aim of which is to keep us elderly elderly, and not to see us go one step further. Staying alive in one’s later years is an art generally requiring the avoidance of wrong moves. The key word to a lot of one’s behavior is “don’t.” If more old people simply did not do certain things, especially on impulse, the world would be a safer........

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