Final answer:
Neglecting personal hygiene is a later manifestation of Alzheimer's disease.
Step-by-step explanation:
The neglect of personal hygiene is a later manifestation of Alzheimer's disease. Alzheimer's disease is a progressive neurodegenerative disorder that affects the brain and leads to cognitive decline. In the early stages of the disease, individuals may experience mild memory loss and cognitive impairment, but as the disease progresses, they may exhibit more severe symptoms such as neglecting personal hygiene.