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.
What's Behind the Behavior. No one knows for sure why some Alzheimer's patients lash out and others don't, but one University of Kansas study showed that recognition was the strongest predictor. Forgetting what something was, or what was inside something, was the most common cause of aggressive behavior.