Older adults tell the story of their lives differently, and it may not be a sign of decline, new psychology study suggests

A new study published in Psychology and Aging reveals that older adults and younger adults alike find it challenging to recall different types of personal memories accurately. Researchers suggest that this difficulty stems from the increased mental effort required to switch between various types of recollection. When faced with changing rules for remembering, older adults tend to include more general facts and less specific details compared to younger individuals, regardless of whether they are recalling a specific event or a recurring routine.

Autobiographical memory, the mental system that enables people to recollect their life history, comprises two primary components: episodic memory, which involves rich recollections of unique events tied to a specific time and place, and personal semantic memory, which consists of broader facts about one's life that are not tied to a single episode.

As people age, the balance between these forms of recall tends to shift. A 2002 study found that younger adults typically provided more specific details about past life events, such as time, place, and emotions, while older adults focused more on general, factual knowledge. For instance, a young adult might recount the specific time and place of their last birthday party, while an older adult would likely provide broader information about similar celebrations they have attended or general knowledge about the people involved.

This trend in older adults' memories has sparked debates regarding whether the shift toward general memories is due to changes in memory storage or age-related declines in executive control, the mental skills used to manage goals, maintain focus, and filter out irrelevant thoughts. Prior studies have explored this by altering the instructions given to participants while they listened to musical clips, observing that younger adults adjusted the specificity of their memories according to the task demands, whereas older adults maintained a more consistent level of detail.

To further investigate the impact of mental flexibility on memory recall, another 2013 study presented university students with a task requiring them to rapidly alternate between recalling unique, one-time events and repeated routines. The results indicated that students performed less accurately when switching between recall rules compared to when they focused on a single rule.

Senior author Louis Renoult, a professor of cognitive neuroscience at the University of East Anglia, noted that while it is commonly assumed that the increased reliance on factual knowledge in older adults represents a compensatory mechanism due to less efficient episodic memory, most assessments of semantic and episodic memory are not well-matched in difficulty, and many memory tests focus solely on episodic memory.

To address these limitations, Renoult and his colleagues developed new memory tests to study both semantic and episodic memory concurrently, under conditions where they are experimentally well-matched. In the new study, researchers recruited 45 younger adults and 45 older adults, all native English speakers without psychiatric or neurological conditions.

After excluding certain participants, the final sample included 37 older adults aged 60 to 85 and 37 younger adults aged 18 to 33. Both age groups had similar levels of education and comparable self-reported symptoms of depression or anxiety, which the authors measured as mood can influence specific memory recall. Participants completed an online memory task involving 21 neutral cue words, one at a time.

Depending on the prompt, they were given up to one minute to either recall a specific memory (a unique event lasting less than a day) or a categorical memory (a repeated event that occurred multiple times in a similar way). After describing each memory, participants rated its vividness and emotional content and whether they experienced it firsthand.