Alzheimer's disease, the most common form of dementia affecting memory and daily tasks, can begin years before symptoms appear. Early identification of symptoms like memory loss or personality changes is crucial for patients and families to access support and potentially slow progression. Factors such as genetics, DNA methylation, nutrition, mental stimulation, physical activity, social interaction, and stress management influence brain resilience and cognitive reserve, which can help slow mental decline. While no cure exists, adopting brain-healthy habits may lower the risk.