For many people who had the disease, the symptoms were believed to be simply signs of normal aging in the brain.

Researchers often assumed that the disease was simply a normal aging of the brain.

It is not, however, a part of normal aging.

The major criticism for the theory is its definition of normal aging.

Is this low testosterone part of normal aging - or a medical problem that needs treatment?

Surprisingly, these experts said, apart from normal aging, the building for the most part has no extensive damage.

It is often found to be a transitional stage between normal aging and dementia.

"However, your readings are not consistent with those resulting from normal aging."

If you have noticed sexual changes that don't seem to be linked to normal aging, talk to your doctor.

Now we know that Alzheimer's disease is different from normal aging.