One of the facts of life is that we all are aging. To make matters worse, there is nothing we can do about it except, perhaps, to laugh. The READER'S DIGEST has carried some delightful humor recently about aging. For example, one woman was quoted as saying that her 81-year-old mother is proud of the fact that she doesn't look her age. One summer day, however, her mother went into a drugstore and, talking about the heat, said to the clerk, "Going to be ninety-seven today."

The man reached across the counter, shook her hand and said, "Happy birthday." She took to her bed for a week over that comment, her daughter said.

Another woman said that her cousin's four-year-old son overheard his mother talking to his grandmother. "Don't worry, Mom," she said. "You're not old ” you're only fifty-fiv…