According to the text, it is INCORRECT to state that:

Alzheimer‘s disease takes so many years, even decades, to cause symptoms that it generally goes unnoticed in one‘s entire life.

The fact that new diagnostic tests are now available and new drugs are in advanced clinical trials represents important improvement not only to diagnose the disease, but also to treat it in its early stages.

The Volumetric Magnetic Resonance Imaging (MRI) technique enables researchers to identify subtle shrinkage in brain areas in the early stages of Alzheimer‘s disease. Fluorodeoxyglucose Positron Emission Tomography

Fluorodeoxyglucose Positron Emission Tomography (FDG-PET) is another technology used in the diagnosis of Alzheimer‘s. This technology has enabled scientists to suspect of Alzheimer‘s prior to the appearance of its very first symptoms.

Nowadays, advanced clinical trials of drugs for Alzheimer‘s are being done.