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.
The Search for Alzheimerâs Causes and Risk Factors. 1  While scientists know Alzheimer's disease involves progressive brain cell failure, the reason cells fail isn't clear. Like other chronic conditions, experts believe that Alzheimer's develops as a complex result of multiple factors rather than any one overriding cause. The greatest risk factors for Alzheimerâs are older age, having a family history of Alzheimerâs and carrying the APOE-e4 gene.