She turned herself in 1492 so she would be about 518 years old if it's still 2010 in Mystic Falls.
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They never mention her true age. However we know she's in high school. And she isn't a junior, because Elena is, and she isn't a senior, so I'd say she's a sophomore, or freshman.
Katherine 560
Katherine needs a werewolf to break the curse on the moonstone.
Katherine is Elena's ancestor and Elena is Katherine's descended
tv on the radio - will do
Rose changed Katherine. She stabbed herself and Rose gave Katherine her blood. Then Katherine hanged herself.