Aging and memory

One of the key concerns of older adults is the experience of memory loss, especially as it is one of the hallmark symptoms of Alzheimer's disease. However, memory loss is qualitatively different in normal aging from the kind of memory loss associated with a diagnosis of Alzheimer's.

Memory decline in normal aging
The ability to encode new memories of events or facts and working memory shows decline in both cross-sectional and longitudinal studies. These deficits may be related to impairments seen in the ability to refresh recently processed information. In addition, even when equated in memory for a particular item or fact, older adults tend to be worse at remembering the source of their information, a deficit that may be related to declines in the ability to bind information together in memory.

Domains of memory mostly spared
In contrast, implicit, or procedural memory typically shows no decline with age and semantic knowledge, such as vocabulary, actually improves somewhat with age. In addition, the enhancement seen in memory for emotional events is also maintained with age.

Retrospective versus prospective memory
Memory is involved in remembering to do things in the future, as well as in remembering what happened in the past. Some studies have found that older adults are worse at prospective memory than younger adults are, yet studies that examine prospective memory in naturalistic contexts often find that older adults are better than younger adults.

Qualitative changes
Most research on memory and aging has focused on how older adults perform less well at a particular memory task. However, recently researchers have also discovered that simply saying that older adults are doing the same thing, only less of it, is not always accurate. In some cases, older adults seem to be using different strategies than younger adults. For example, brain imaging studies have revealed that older adults are more likely to use both hemispheres when completing memory tasks than younger adults. In addition, older adults sometimes show a positivity effect when remembering information, which seems to be a result of the increased focus on regulating emotion seen with age.