The Vampire Diaries, Season 5

Katherine:
So what am I looking at here, hmm, blood clot, tumor, what?

Max:
I did a full workup on your blood, Katherine. It's clean.

Katherine:
My hair is going gray, and my teeth are falling out. I'm not sure what the suggests, but it's definitely not health.

Max:
Patient is irritable. Not sure if this is a symptom or personality.

Katherine:
(breaks the recorder) Personality. Now tell me exactly what the hell is going on with me.

Max:
You're aging.

Katherine:
What?

Max:
You said you were turned into a vampire 500 years ago, give or take, and now that your human, let's say time is catching up with you.

Katherine:
Ok. Ok. Well, how do we stop it?

Max:
We don't. It's just life running its course quicker than normal.

Katherine:
How much quicker?

Max:
If it continues at this rate, you have a few months. I'm sorry.