My father was recently diagnosed with this horrible disease and we think it probably went undiagnosed for years before this. The early symptoms are so similar to what people consider normal age-related cognitive decline. My brother and I learned through a genetic test that we're 2.5x more likely than average to eventually contract it. Thankfully, my father has found a drug that's working for him but it will only work for a short period of time. Still, it's given us more time that he would've otherwise had.