The group photo was taken somewhere between 1959 and 1962. 1962 was 46 years ago, so in order for the woman in the picture to be 55 today, she would have had to be nine years old in the photo.
Am I missing something?
You said:
>>>The woman in the picture looks to be in her 20’s or 30’s, so would have to be in her late 60’s or 70’s today. Okubo looks to be in her 40’s or 50’s, judging by this closeup of that picture you posted. <<<
If she is around 55, that would fit into your stated timeline.