Philana: How old would you say I am? Don't be afraid. I'm not vain.
Philana: That old? I stopped aging at 30. Well, anyway, you're off by 2,000 years. I'm 2,300 years old. We were married very young. I was only 117, and he was 128.
Philana is telling Kirk and Spock how old she is. I wouldn't have guessed a day over 1,700 myself.