Alzheimer's disease and Second childhood

Alzheimer's disease noun - A progressive form of presenile dementia that is similar to senile dementia except that it usually starts in the 40s or 50s; first symptoms are impaired memory which is followed by impaired thought and speech and finally complete helplessness.

Second childhood and Alzheimer's disease are semantically related In some cases you can use "Second childhood" instead a noun phrase "Alzheimer's disease".

Second childhood noun - The state or period of mental decline that typically accompanies old age.

Alzheimer's disease and second childhood are semantically related in senility topic. You can use "Alzheimer's disease" instead a noun phrase "Second childhood".