Various studies place the average age of cataract surgery patients at between 70 and 73. More Info: The incidence of cataracts among Americans is relatively high.
Serotonin. Serotonin is an inhibitory neurotransmitter involved in the regulation of mood, anxiety, libido, compulsivity, headaches, aggression, body temperature, eating disorders, social anxiety, phobias, sleep, appetite, memory and learning, cardiovascular function, muscle contraction, and endocrine regulation.
Glutamate (Glutamic acid) is the most prominent neurotransmitter in the body, and it is the main excitatory neurotransmitter, being present in over 50% of nervous tissue. Glutamate was initially discovered to be a neurotransmitter in insect studies in the early 1960s.