She provides some insight

Hunter looked at her with surprise, and she laughed again, her white teeth flashing. "I see you doubt me. Dunnigan no doubt told you that the ageing process is slowed, but not ceased. He told you a partial truth. We can, if we choose, slow the process to the extent where it barely exists. How old do you think I am Mr. Collins?"

"You appear to be in your mid-thirties, but Henry told me he was one hundred and eighty three years old, and he looked to be in his sixties. I'd hesitate to guess.

"I became Were on a fine spring afternoon in 1658. In a town called Salem. I am over three hundred and fifty years old, and I have every intention of living forever. Oh I see the doubt in your face. But I do not lie Mr. Collins. We of the Strain can live indefinitely, have we the will and the courage to act. Those like Dunnigan are weak, falling prey to human morality that no longer applies to us.

For we are not human Mr. Collins. Not any longer. We are Were. We are of the Strain. And we are born to rule."