1. Hearing, and acting on it
Among modifiable factors, untreated hearing loss carries one of the heaviest published associations with later cognitive decline. It is also the one most commonly left for years, partly because the deterioration is gradual enough to adapt to without noticing.
The immediate effect is more concrete than the long-term one. Straining to follow speech consumes the attention that storing new information requires. Somebody who cannot quite follow the conversation at a family table is often described as forgetful when the problem is that they never clearly received it.
If a hearing aid has been bought and is sitting in a drawer, getting it fitted properly is a higher-value intervention than anything else on this page.
2. A medication review
Few people over seventy take fewer than four medications, and several common classes affect cognition: sedatives, some antihistamines, some bladder medications, some blood-pressure drugs, and anything with anticholinergic activity.
A structured review with a pharmacist or GP — bring the actual boxes, not a remembered list — occasionally resolves a memory complaint entirely. It is free and it is under-used.
3. Movement, at whatever level is available
Aerobic exercise has the strongest evidence base in this field and the threshold is lower than people assume. Regular walking counts. Chair-based exercise counts for those who cannot walk far.
The common error is believing it is too late to start. It is not. Beginning at seventy-one still carries benefit.
4. Company, specifically
Social contact outperforms puzzle books, because a person cannot be anticipated and a grid of clues can. Conversation demands attention, prediction, memory for what was just said, and emotional reading simultaneously, in real time.
Isolation after retirement or bereavement is one of the more under-recognised risks here, and it tends to compound quietly.
5. The treatable causes, checked properly
Thyroid function, B12, vitamin D, depression, sleep apnoea. All common in this age group, all producing memory and concentration complaints, all treatable. Depression in older adults in particular often presents as cognitive complaint rather than visible low mood.
6. Vision
Cataracts and uncorrected sight do to visual information what hearing loss does to speech. Cataract surgery is one of the more reliably effective procedures in medicine and the backlog of people who have not had it is considerable.
7. And then a supplement, if wanted
Last, and with two specific cautions for this age group.
Interactions are more likely, because more medications are in play. Ginkgo with blood thinners is the one that matters most, and blood thinners are common after sixty-five. Take the label to a pharmacist before starting — which is only possible if the amounts are printed on it.
The evidence was gathered in this age group, which is worth knowing. The curcumin trial recruited adults aged 51 to 84. The lutein trial used older adults. These are not studies of twenty-year-olds extrapolated upwards.
What they found was modest, slow, and absent for a share of participants. That is the accurate expectation. Check the interactions first.
The line worth holding
If memory is getting worse rather than holding steady, none of this applies yet. That is an appointment, and several of the causes found at one are treatable.