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.
Severe stress in middle age can lead to Alzheimer's by damaging the brain, experts warn. 1  Canadian scientists believe neurons involved in chronic anxiety and fear 'extensively overlap' in areas also associated with Alzheimer's disease.  Stress in middle age could cause dementia by damaging the brain, new research suggests. Neurons involved in chronic anxiety and fear 'extensively overlap' in areas also associated with Alzheimer's disease, say scientists. Mid-life stress has been previously linked to a higher risk of Alzheimer's disease.