Nonagenarian.
Genesis 17:17 (NKJV)Then Abraham fell on his face and laughed, and said in his heart, "Shall a child be born to a man who is one hundred years old? And shall Sarah, who is ninety years old, bear a child?"
...There is no such thing. It would be a square. It's a square. -____- at the person before me.
70 - 79 - septuagenarian80 - 89 - octogenarian100 years old - centenarian
A centenarian is a person who is 100 years old or more. Once they are 110 they are called supercentenarians.
A person aged between 90 and 99 is called a nonagenarian.
He would be a nonagenarian.
A Person Between The Ages Of Eighty And Ninety Is Called an Octogenarian. (:
Centenarian
A one-hundred-year-old person can be called a Centenarian.
A nonagenarian is between 90 and 99 years of age. This is preceded by the octogenarian, and is followed by the centenarian.
Someone who is a hundred years or older is commonly referred to as a centenarian.
A person who has exhausted all ninety-nine possible weeks of unemployment benefits.
Nonagenarian.
George Washington. One hundred percent fact.
There's nothing wrong with saying or writing fifteen hundred ninety one since, well, that's exactly what it is. As a point of style, it might be more accepted to simply say or write fifteen-nintety-one. As a technical point, it might actually be correct to say one-thousand-five-hundred-nintety-one, but that would seem strange for a date. Chances are the person who is telling you that once had a professor or an educator who said that it should be one way. Perhaps styleguides do dictate or recommend one way at the expense of another, but really anybody who says that "fifteen hundred ninety one" is not an acceptable way to write or vocalize "1591" is certainly wrong and perhaps pigheaded.
An octogenarian is a person who is between the ages of 80 to 89. A nonagenarian is a person who is between the ages of 90 to 99.