Up to 45% of dementia risk could be prevented or delayed by addressing modifiable factors, according to second-edition risk-reduction guidelines the World Health Organization released on 15 July 2026, described in World Health Organization news. For adults over 65, those modifiable factors mean everyday influences on brain health that can still be changed, such as activity, smoking, blood pressure, hearing, mood and social contact.
Prevention matters at scale because more than 57 million people live with dementia worldwide and nearly 10 million receive a new diagnosis each year, as reported in the same World Health Organization announcement. Older adults cannot change age or genes. They can still act on heart health, senses, movement and connection.
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
- Where does the 45% figure come from?
- Which risks count most after 65?
- What weekly steps does WHO advise?
- How should you start and stay safe?
Where does the 45% figure come from?
The 2026 WHO update is the first major revision since 2019. It builds on work by the July 2024 Lancet Standing Commission led by UCL, which linked about 45% of cases to 14 life-course factors, up from 40% and 12 factors in 2020, according to BrightFocus Foundation reporting.
The number is a population estimate. It reflects the share of cases linked to those factors across populations, based largely on observational data. It does not promise that any one person over 65 can cut personal risk by 45%.
Which risks count most after 65?
WHO covers 14 modifiable factors. They include physical inactivity, smoking, harmful alcohol use, poor diet, hypertension, diabetes, obesity, depression, hearing loss, social isolation and air pollution. High LDL cholesterol and untreated vision loss joined the list as newer additions.
Two factors carry especially large shares. Hearing loss and high LDL cholesterol are each linked to about 7% of cases. That makes hearing care and cholesterol control high-value checks for older adults, alongside blood pressure, blood sugar, weight, mood, sleep routines and social contact.
What weekly steps does WHO advise?
For adults 65 and older, WHO recommends at least 150 minutes of moderate-intensity aerobic activity each week, plus muscle-strengthening and balance activity, as reported by the Royal Australian College of General Practitioners. Brisk walking, cycling, swimming, chair exercises, light weights and balance practice can count.
Spread activity across the week and build up gradually. WHO also advises tobacco cessation, limiting harmful alcohol use, eating a healthy balanced diet, and keeping cognitive stimulation plus social engagement, according to Open Access Government reporting on WHO guidance. For people with normal thinking or mild cognitive impairment, social and mental activity remain part of the advice.
- Walk briskly for 30 minutes on five days, or split it into shorter bouts.
- Add two short strength sessions and simple balance work.
- Stop smoking, limit alcohol and eat regular balanced meals.
- Treat hearing promptly, join one weekly social activity and keep learning.
How should you start and stay safe?
Start with one medical review. Ask about blood pressure, diabetes, weight, cholesterol, depression, hearing and vision. Bring a list of medicines, alcohol use, smoking, falls, sleep problems and isolation.
Small fixes add up, such as using hearing aids, adjusting activity after illness and scheduling regular contact with family or friends. Age still raises risk, and healthy habits do not remove it. Pollution, genetics, illness and access to care also play roles. Book the hearing check, blood pressure check and activity plan first, then repeat them yearly.
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- The WHO 45% Modifiable Dementia Risk Estimate in 2026: Questions Adults Over 65 Can Discuss With a Clinician
- WHO’s Second Dementia Risk-Reduction Guideline in 2026: Practical Evidence-Based Steps for Adults Over 65
- Dementia Subtype Data Gaps Identified by NIA in 2026: Study Design and Evidence Limits for Adults With Memory Concerns
