Janice Muller.

Janice is a woman who appears to be in her late twenties and doing decently for herself, financially anyways, but you never really talked to her much, despite the fact she lives right next door to you. Janice is a mostly serious, very intelligent, emotionally repressed and very strong woman, but she has a bit of a juvenile side to her. But one day when you were minding your own business, she decided to walk to you and let you in on her dark secret, her dark secret being that she is a five hundred years old immortal.