From national testimony of the Alzheimer’s Association Chief Public Policy Officer November 14, 2019 before Congress:
Most individuals experience dementia in stages-early, middle, and late. That means that they need different supports and services over the disease course. For example:

• In the early stages, individuals may still function independently. They may still drive, work, and be part of socialactivities. As some common difficulties develop–like trouble with planning or organizing–individuals (particularly those who live alone) may find it helpful to have access to occasional homemaker services.
• In the middle stage, which can last for many years, people with Alzheimer’s will require greater levels of care. They may not be able to work, they may withdraw socially, and they experience increased confusion and behavioral changes, including an increased risk of wandering and becoming lost. These individuals often still need social engagement and assistance with daily activities, and caregivers need increasing support. An adult day program may meet some of these needs.
• In the late stage, individuals lose the ability to respond to their environment, to carry on conversations and,eventually, to control movement. Significant personality changes may take place and they need extensive help with daily activities and personal care. They also become increasingly physically vulnerable, eventually losing the ability to walk, sit, and swallow. These individuals are likely to need intensive nursing care, often provided in a facility.