PUMCH Dementia Longitudinal Cohort Study

This is a long-term study tracking people with neurodegenerative dementia over time to better understand how these diseases progress. Researchers will collect regular data on thinking, behavior, and brain changes. **You may be eligible if...** - You have a confirmed diagnosis of neurodegenerative dementia (such as Alzheimer's disease, Lewy Body Dementia, or Frontotemporal Dementia) - You have a regular caregiver who can accompany you for follow-up visits **You may NOT be eligible if...** - You have mild cognitive impairment (MCI) without a dementia diagnosis - You have serious other medical conditions, or significant vision or hearing problems that prevent assessment - You do not have a regular caregiver - You do not consent to participation - Your estimated life expectancy is less than 2 years Talk to your doctor to see if this trial is right for you.