A study says doing less housework in later life may be linked to changes in thinking: Why context matters

Imagine visiting a parent who has always washed clothes on Monday mornings. Recently, the laundry has been waiting until the weekend. You notice the change. What you do not yet know is why. Perhaps someone else has taken over. Perhaps carrying the basket has become difficult.

A change in chores can have different explanations. Research suggests that, among older adults, declining participation in housework may also be associated with changes in cognitive health. Start by understanding the person’s experience.

What did the US housework study find?

Researchers led by Nan Wang, affiliated with the University of California, Davis, analysed 8,141 adults aged 65 or older. The 2025 study published in The Permanente Journal used data from the US Health and Retirement Study.


Researchers compared activity-frequency reports from 2008 and 2010. They then examined cognitive test scores collected between 2010 and 2018.


People whose frequency changed from high to low showed faster cognitive decline, on average, than those whose frequency remained high.

The survey asked about mildly energetic activities, using household chores as examples. “High” meant more than once a week; once a week or less counted as “low.” The finding is an association. It does not establish that cleaning less causes dementia.

Why does housework involve more than physical movement?

Psychologist Adele Diamond describes “executive functions” as mental processes that support purposeful action. Ordinary chores can call on these abilities.

Imagine sorting laundry. You keep washing instructions in mind while separating clothes. Holding information briefly and using it is “working memory.”

You realise a shirt cannot go into the machine. Switching to another approach involves “cognitive flexibility.”A finished basket makes the physical work visible. The thinking behind it is easier to overlook.

Diamond’s framework helps explain these mental demands. It does not turn a laundry mistake into a diagnosis.

What is cognitive reserve?

Neuropsychologist Yaakov Stern uses “cognitive reserve” to explain why people can respond differently to age-related brain changes.

Some people maintain everyday functioning despite more underlying changes than others. The idea concerns flexibility and efficiency in how people use their cognitive abilities.

Stern’s research reviews associations between life experiences and resilience. Education and mentally engaging leisure activities are among the experiences studied.

Housework can involve practical problem-solving. Researchers therefore discuss reserve as one possible explanation for the connection between domestic activity and cognition.

The housework study did not directly measure reserve. Nor does the theory say that keeping a spotless home protects someone from Alzheimer’s disease.

Could cognitive changes make someone do less housework?

Yes. Researchers call this possible direction “reverse causation.” Instead of reduced activity producing thinking difficulties, emerging difficulties might make familiar tasks harder to begin or complete.

A person could struggle to organise the steps involved in washing clothes. Such difficulty differs from deciding to leave laundry until Saturday.

The study authors acknowledged that reverse causation could remain despite their analyses.

Researchers look at timing through measuring activity before later test scores. It cannot completely exclude changes that were already developing.

Does a change in cleaning habits mean dementia?

No. A household routine cannot establish a diagnosis. The National Institute on Aging explains that occasional forgetfulness can occur with normal ageing. More serious memory problems interfere with everyday activities.

Health conditions or medication effects can also contribute to memory difficulties. Emotional problems may affect remembering too.A change from someone’s usual routine therefore needs context.

Consider the parent in our opening scene. A relative might now handle the laundry. The parent may still manage other familiar activities.

Another person might be finding several everyday tasks increasingly confusing. Those situations should not be treated as interchangeable simply because both homes have unwashed clothes.

How should families respond to a change in routine?

Start by asking what has changed, rather than deciding what the change means.

The National Institute on Aging recommends asking older adults directly about the help they need.A simple conversation might reveal that carrying the basket is the problem. Support can then address that practical difficulty.

If changes are accompanied by noticeable memory or thinking problems, discuss them with a health professional. An assessment can help identify the cause. The number of clean shirts is only one small piece of the picture.