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 work was funded by NIH's National Institute on Aging (NIA) and National Human Genome Research Institute (NHGRI), as well as by 18 other international public and private organizations. We do not fully understand what causes Alzheimer's disease, but we know that genetic factors can play a role, says NIA director Richard J. Hodes. M.D. Scientists have previously identified three genes, variants of which can cause early onset Alzheimer's, and one that increases risk for the late onset form.