QUESTION: If a person in their eighties is called an octogenarian then what is a person in their nineties called?

I looked up octogenarian, hoping to come across a website that had a general list but came up with mainly sites specifically about octogenerians (a lot of medical research stuff). So, I went out on a limb and typed in "ninogenarian" and google, bless them, corrected my spelling and came up with nonogenarian.

Nonogenarian: n. A person 90 years old or between 90 and 100 years old [from Latin nonagenarius]

Nona is Latin for nine or ninth.

The picture is of my mom and grandmother. My mom is nowhere near a nonagenarian. However, if my grandmother had lived (d. 1988) she would be a nonagenarian.