An Oxford University study reveals that heart disease, atrial fibrillation, diabetes, anxiety, depression, and stroke in midlife significantly elevate dementia risk. Early onset of these conditions, particularly before age 55, poses a greater threat. Proactive health management and lifestyle adjustments during your 40s, 50s, and 60s are crucial for brain health protection.An Oxford University study reveals that heart disease, atrial fibrillation, diabetes, anxiety, depression, and stroke in midlife significantly elevate dementia risk. Early onset of these conditions, particularly before age 55, poses a greater threat. Proactive health management and lifestyle adjustments during your 40s, 50s, and 60s are crucial for brain health protection.