Scientists believe this is the first time amyloid accumulation has been shown in such young human brains.

“Discovering that amyloid begins to accumulate so early in life is unprecedented,” said lead investigator Changiz Geula, PhD, research professor in the Cognitive Neurology and Alzheimer’s Disease Center. “This is very significant. We know that amyloid, when present for long periods of time, is bad for you.”
Brain 3/2/15