The average age for cataract surgery is approximately 73 to 75 years old. But cataracts can occur in the 30s, 40s, and 50s. Of course the older the patient gets the more common the cataracts.
Two neurotransmitters seem to play a role in Alzheimer's Disease: acetylcholine and glutamate. Acetylcholine (ACh) activates muscles and helps with arousal, short-term memory, and learning. Individuals with AD have low levels of ACh.
Causes of Alzheimer's disease. Alzheimer's disease is the most common form of dementia. In Alzheimer's, the loss of brain cells leads to the brain shrinking. Part of the brain known as the cerebral cortex is particularly affected by this shrinkage. The cerebral cortex is the layer of grey matter covering the brain.