Thanks everyone for your comments. My wife of 52+ years has gone through all the normal physical (MRI, blood, ENT, etc) tests and the results from her Neurologist is she has MCI. The Neurologist has also stated that: 1, there is no cure; 2, no one can project how the disease will progress; 3, (and my favorite) if you have seen one case of MCI, then you have only seen one case of MCI because each MCI patients is unique.
My wife did have the neuropsych tests back in 2014 & 2015 but nothing really beneficial came from the tests. Other than MCI, she is very healthy and exercises at the gym 4-5 days a week. I do 99% of the driving and we are enjoying everyday by doing something fun and/or different. Some of the psychologists she has seen want to try her on various drugs but she has decided not to be a guinea pig for the drug companies. If her neurologist is correct and there is no current medication proven to cure or slow the progression of MCI, then why spend 3-6 anxious hours taking a neuropsych test?