I suspect that those who have reached the grand old age of 82 would be flattered by the recognition.
It is certainly true that you have to be careful in describing a woman's age, especially to the woman. But there are few octogenarian women who labour under the misconception they are still young or even middle-aged. They are old, they know it, and they are generally proud of it.
That said, "80 is the new 60," which means we are getting older, staying active longer. My 82-yr-old mother is 20 years older than her mother when she died. Anyone of the previous generation would be in a rocking chair at 82. My mother is not particularly healthy, but she and Dad gallivant across the country in their Winnebago between doctor's appointments in three states. And she still send me Old People joke e-mails.