Normal memory slumps can be harmless—when to worry

when should – For many people, forgetfulness is a normal part of ageing—especially changes in episodic memory that can begin in the 60s. But neurologists say to pay attention when lapses become a repeating pattern, interfere with daily functioning, or accelerate enough that

You can blame the body for a lot of small indignities, but memory lapses hit differently. You walk upstairs and wonder why you went. You blank on a person’s name right as you’re introducing them. Or you finally find your car keys—tucked in the fridge, of all places.

Moments like these are disconcerting, but they’re also expected. Ulman Lindenberger. a cognitive neuroscientist and director of the Max Planck Institute for Human Development in Berlin. says decline in what researchers call episodic memory—what happened. where and when—is a normal part of human cognitive ageing. “In most adults. decline becomes apparent in their 60s. ” he says. and it affects memory across the process: from encoding new events. to consolidation. to retention and recall.

That shift doesn’t arrive out of nowhere. Lindenberger points to structural and functional changes to the brain that begin in middle age and accelerate from there. In a 2025 paper analysing more than 3700 “cognitively healthy” adults. Lindenberger and his colleagues found that age-related memory decline closely tracks with deterioration in connections between brain regions. The changes are tied to the gradual degradation of the fatty coating that insulates neurons and to shrinkage of the hippocampus. a brain region crucial for forming new memories.

In his view, this is usually not a reason to panic. “Learning and episodic memory are all about forming new. and remembering previously formed. associations—and the corresponding machinery of our brains becomes less reliable with advancing adult age. ” he says. Even seemingly classic “forgetfulness” can be explained by something more immediate: attention. Everyday lapses can be failures of attention—if your brain never properly encoded where you put your keys because you were distracted or stressed. there may be little to retrieve later.

But where normal slowdown ends and something more suspicious begins is harder to draw.

Neurologists tend to notice when forgetfulness turns into interference. Ronald Petersen. a neurologist at the Mayo Clinic in Minnesota. says clinicians become concerned when incidental forgetfulness becomes a pattern that interferes with daily functioning—when people forget things they used to remember. or when they forget important information. He gives the kind of details many families recognize right away: “We get concerned when individuals start to forget important information like doctor’s appointments or golf tee times.” If it becomes a repeating problem that others can see—Petersen says it “might be time to seek attention.”.

Petersen also suggests one practical way to think about patterns: repetition, and how often it happens. “Tending to repeat oneself, without awareness, on a frequent basis… that might be worrisome,” he says.

That conversational repetition can be more than annoying. It connects to what happens in mild cognitive impairment—the transitional stage between typical ageing and dementia—and in early-stage dementia. In Alzheimer’s disease. the most common form of dementia. early changes occur in the hippocampus and the entorhinal cortex. both crucial for encoding and consolidating new episodic memories. The result is an imbalance: struggling to form new memories, not simply losing older ones.

So, if someone asks the same question several times in the space of an afternoon, it may be because the memory of asking the question never properly formed in the first place—a potential red flag.

Getting lost in familiar places can be another widely cited cause for concern. but there isn’t a simple checklist that applies to everyone. Lindenberger says even neurologists struggle. especially in advanced old age. because “the line between the lower range of normal [age-related memory decline] and dementia is difficult to draw.” He puts it plainly: there isn’t a sharp distinction. in terms of behaviour or even biology. between normal ageing and dementia.

That grey zone matters, because memory is also sensitive to other forces. Anxiety, stress and depression can temporarily impair attention and episodic memory. Menopause can play a role too, and so can medications. In other words, it’s worth considering what else might be behind signs of cognitive impairment before jumping to conclusions.

It’s also possible to over-interpret. A 2025 study found that older adults with high levels of what researchers call “dementia worry” are more likely to interpret everyday memory lapses as signs of impending cognitive decline than those in a control group. That same kind of worry has been associated with negative health outcomes.

The bottom line is that even trained neurologists can’t always separate “normal” from “worrying” with certainty. What they do agree on is the momentum of decline—how it changes. not just how it looks on any single day. As Lindenberger puts it. “there is reason to be concerned when [memory] decline is fast and starts to interfere with daily routines.”.

memory slowdown episodic memory cognitive ageing hippocampus mild cognitive impairment dementia worry Alzheimer’s disease attention neurologist guidance