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Septuagenarian, octogenarian, ....
Larry asked about a word for a person who is ninety+ years of age.
As you may know, the word for a person in their seventies (70's) is septuagenarian.
The word for a person in their eighties (80's) is octogenarian.
And the word for a person in their nineties (90's) has the same ending as the other two: nonagenarian.
Here is a sample sentence with nonagenarian:
- Last year, when my neighbor became a nonagenarian, she decided she was too old to live by herself, and moved in with her daughter.
I hope this helps.