How old is my beautiful wife ms katherine pierce?

Katherine is seen in the 1800s as she meets Damon and Stefan, and in the 1920s as she watches over Stefan. But by the time of her death in The Vampire Diaries's season 5, as a delayed side effect of taking the cure for vampirism, Katherine is over 500 years old.

Explanation:

Katherine was seen in the 1800's and now is over 500 years old.

answer///cannot be totally predicted;