Sally's mother was diagnosed with Alzheimer's disease at age 50.Courtney's grandmother was diagnosed with Alzheimer's disease at age 82.Sally's mother's disease is more likely to have a genetic component.

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Early-onset Alzheimer's (before age 65) is more likely to have a genetic component, while late-onset Alzheimer's (after age 65) is more likely to be influenced by environmental and lifestyle factors. Since Sally's mother was diagnosed at age 50, her disease is considered early-onset and therefore more likely to have a genetic component. Courtney's grandmother was diagnosed at age 82, which is considered late-onset.

Sally's Mother Was Diagnosed with Alzheimer's Disease at Age 50