Setting aside the notion of determining the number of individual animals on the planet for a moment, merely determining the number of species on the Earth is challenging. Science has only been able to offer estimates thus far, and totals vary greatly.
People who have early onset Alzheimer's may be in any stage of dementia â early stage, middle stage or late stage. The disease affects each person differently and symptoms will vary. If you are experiencing memory problems: 1  Have a comprehensive medical evaluation with a doctor who specializes in Alzheimer's disease.
Alzheimer's disease is an irreversible and progressive disorder that damages and destroys brain cells, inducing memory loss and negatively impacting cognitive abilities, such as thinking skills and reasoning. There are two types of Alzheimer's disease: early-onset Alzheimer's: develops between the ages of 30 and 60.