New research suggests that blood tests may help predict the age Alzheimer's symptoms could begin at, through the detection of a protein linked to the disease. The study included more than 600 adults aged 62 to 78 with no cognitive impairment. The predictions have a three- to four-year margin of error, and experts say the tests are not ready for use in healthy, asymptomatic people. They also found that other conditions, including kidney disease and obesity, may affect results. “Alzheimer's disease is a complex condition with numerous intersecting risk and resilience factors that vary from person to person.” Early detection may help guide treatment, and two drugs have already been approved that can slow progression if started early. Clinical trials are also testing whether early treatment could delay symptoms in at-risk adults, although there is currently no cure. Researchers are also exploring whether treating at-risk adults early could delay the onset of symptoms, though there is still no known cure. However, experts suggest that lifestyle factors like exercise, diet, and social activity still play a key role in prevention.