Does the term early onset alzheimers disease mean alzheimer at and early age or does it mean the disease is just starting?

The term "early onset Alzheimer's disease" refers specifically to Alzheimer's that occurs in individuals typically under the age of 65. It does not mean the disease is just starting; rather, it indicates that the symptoms and diagnosis happen at a younger age compared to the more common late-onset Alzheimer's, which typically affects older adults. Early onset Alzheimer's can progress similarly to late-onset, but it may have different genetic and environmental factors influencing its development.