Researchers in a memory lab at Texas A&M University noticed that all the older people coming in as volunteers were really worried about how they'd do.
So the scientists decided to measure how taking a memory test affects a person's subjective sense of age.
Before the test, the 22 participants felt pretty darned good. Even though their average age was 75, they said they felt about 58.
Then they were given a list of 30 nouns, told to study them for two minutes, and then asked to recall as many of them as they could in three minutes.