Could this possibly be
Margaret M. Kilkoyne?
http://www.charleyproject.org/cases/k/kilcoyne_margaret.html
Age: Margaret went missing in 1980; she was 50. The UID was found in 1996, 16 years later. If Margaret had been alive in 1996, she would have been 66 in 1996, which does fit with the estimated age of the unidentified per NAMUS - 50-70 years old.
Height: The UID is reported to be 5'0". Margaret is reported to be 5'0".
Weight: The UID is reported to be 157 pounds. Margaret is reported to have weighed 140 back in 1980 when she first went missing. She could have gained 17 pounds in 16 years.
Hair: The UID is reported to have Red/Auburn hair. Margaret is reported to have red hair and blue eyes.
Eyes: The UID shows a photo of eyeglasses in NAMUS; Margaret is reported to have worn Horn rimmed eyeglasses back in 1980.
I also think that Margaret does resemble the UID.
NOTE: Margaret was a nurse who then went onto become a cardiologist. She is reported to have been experiencing severe mental stress and depression and/or mania at the time of her disappearance. She felt that people at work were spying on her.
She apparently was very educated and wealthy, as it is reported on Charley Project that she left behind an estate of $200,000. Her financial status and her education could account for her having the means to travel for 16 years or having the means to find other employment during those 16 years until perhaps her mental state overcame her and she committed suicide.
She was declared legally dead in 1989.
Anyone think this is worth a shot? I'd like to see the UID be identified. Anyone want to submit, please feel free to.
https://identifyus.org/en/cases/6279