Dementia is not a natural part of aging but a set of symptoms arising from various brain diseases. According to current scientific knowledge, by influencing 14 risk factors, it would be possible to prevent up to 45% of dementia cases or delay their onset. Alzheimer's disease is the most common cause of dementia, accounting for approximately 60 to 70% of all cases. To support brain health, it is important to care for the heart and blood vessels, engage in regular physical activity for at least 30 minutes daily, eat a varied diet rich in vegetables, fruits and fish, ensure quality sleep, and avoid smoking and alcohol. Other beneficial factors include maintaining social contacts, mental activity, caring for hearing and vision, maintaining healthy body weight, and taking care of mental health. People aged 65 to 80 are entitled to a free memory test as part of a preventive examination with their general practitioner.