Earlier, I wrote about the rosy, sunny image of “the good old days” and the sad reality that those days just never existed. A body of psychological evidence explains in part why we cling to this fantasy: we have a tendency to blanket our old memories with simplicity and inaccuracy.

First, memory tests conducted on the elderly suggest that as we age, we become more likely to remember warm, pleasant experiences and steer clear of recalling negative stimuli. Though most of us associate old age with grouchiness and malcontentment, older people actually tend to filter their memories in favor of the enjoyable.

In a 2004 study at Stanford, professor of psychology Linda Cartensen asked young adults and elderly adults to view a variety of slides and then complete a memory exam on the scenes they had witnessed. Though young adults beat out the elderly on overall short-term memory, elderly adults demonstrated a remarkable ability to recall pleasing scenes, such as those of happy infants and puppies, and performed even better than their young counterparts in this regard.

Surprised at these results, Cartensen also monitored the moods and memories of adults aged 18 to 94, and found that older adults reported greater happiness and spent less time “wallowing in bad moods” that brought younger respondents down. In a review of Cartensen’s study, Psychology Today wrote that seniors tend to “revise history” to make the overall image of their life appear more appealing. The article continues:

“Pleasant memories are always invading [seniors’]