The World Health Organization states up to 45% of dementia risk could be prevented or delayed by addressing modifiable risks across life. Modifiable risks mean health and lifestyle factors people can change.
For adults over 65, the main barriers are access to care and daily follow-through, not lack of guidance. Dementia means ongoing loss of memory and thinking skills that affects daily life. The 45% figure is a population estimate, not a personal promise, and it assumes action on 14 different risks together.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What does the 45% number mean?
- Which 14 risks should older adults know?
- Why does blood pressure control fall short?
- Why do so few older adults use hearing aids?
What does the 45% number mean?
The 45% figure comes from the 2024 Lancet Commission led by UCL researcher Gill Livingston. That group linked 14 changeable factors to about 45% of dementia cases worldwide, according to UCL. WHO adopted that evidence in its second-edition dementia guidelines, as described in its July 2026 guidelines report.
The guidelines say timely action across life can prevent or delay many cases. The number is a conditional maximum for whole populations. It assumes all 14 risks were fully removed, so no person can claim 45% lower personal risk from one change alone.
Which 14 risks should older adults know?
WHO lists tobacco, alcohol, physical inactivity, social isolation, air pollution, hypertension, diabetes, hearing loss, and vision loss among the 14. Hypertension means blood pressure that stays too high. After 65, blood pressure, hearing, vision, diabetes, activity, and social contact often need the most attention.
These factors appear together in many older households. Hearing loss and isolation deserve joint attention. Untreated hearing loss can make conversation harder, and missed conversation can reduce social contact.
Why does blood pressure control fall short?
About 70% of U.S. adults age 65 and older have high blood pressure, but only about half have it controlled below 140/90 mmHg, CDC reports in its blood-pressure Vital Signs report. Control means keeping readings below the treatment target over time. At least 25% of Medicare Part D enrollees age 65 and older do not take blood-pressure drugs as directed, the same CDC report finds.
Listed reasons include cost, no symptoms, complex regimens, side effects, and forgetting. Cost also delays wider care. KFF analysis of 2024 national survey data found about 1 in 6 adults delayed or skipped care because of cost, including rationing prescriptions. The 2025 heart-specialist guideline now aims below 130/80 and cites stronger proof linking control to lower dementia risk. Practical follow-through helps:.
- Take pills at the same daily event, such as breakfast or brushing teeth.
- Use a weekly pill box and keep a current list in a wallet.
- Ask the pharmacist about side effects, timing, and simpler dosing.
- Report home readings and missed doses at each visit.
Why do so few older adults use hearing aids?
Among U.S. adults age 70 and older who could benefit from hearing aids, fewer than 1 in 3 has ever used them, NIDCD reports in its hearing statistics page. Use means ever trying the devices, not regular current use.
Price, appointments, fitting, batteries, maintenance, and stigma can delay first use. Poor hearing can also make medical visits harder, when drug names and dose changes are easy to miss. A primary-care visit can connect both problems. Bring all pill bottles, a blood-pressure log, and notes on missed words, TV volume, and skipped gatherings, then ask what local services cover testing and follow-up.
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