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.
Marijuana and Alzheimer's Mental Decline. The researchers also injected rats with a protein called beta-amyloid, which gave the rats an Alzheimer's-like brain condition. Some of the same rats were also injected with a cannabinoid.