When alzheimer disease appears in middle age rather than old age, it:

a. progresses more slowly.

b. progresses more rapidly.

c. causes death within a year.

d. is benign?

When alzheimer disease appears in middle age rather than old age; it progresses more rapidly. Alzheimer's disease that results from the brain cell death. It is a neurodegenerative disease; such that there is progressive brain cell death that happens over a period of time. The brain tissue gets fewer and fewer nerve cells and connections.