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.
Anosmia may be one of the first symptoms of Alzheimer's. Huntington's disease and Parkinson's disease as well as diabetes and multiple sclerosis, can also cause anosmia. Schizophrenia, a mental illness characterized by hallucinations and delusions, also can cause anosmia. Head injury can also cause anosmia.