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Marceline is over a thousand years old, as she said in "Evicted!" and "Daddy's Little Monster." In "Memory of a Memory," one of Marceline's memories shows her as a young girl playing near the burning ruins of a city, presumably the aftermath of the Mushroom War. It is later found out in "I Remember You" that the Ice King gave her Hambo during the war. It is revealed in "Finn the Human" that Marceline already knew the Ice King by the end of the war, confirming that the events shown in "I Remember You" happened during the war, not after. It has yet to be explained how Marceline returned to her family. It is revealed in "Finn the Human" that Marceline was still traveling with the Ice King as the events in that alternate universe cause the Ice King to die and she chooses to guard his body.
When Marceline was a teenager, her father ate her fries in the ruins of a diner, as Finn witnessed in her memory. This incident damages Marceline's relationship with her father, which she later sings about in her "Fry Song." At a later point in her history, the first memory where she is chronologically seen as a vampire, she moved into the Tree Fort (that would later become Finn and Jake's home) with her boyfriend Ash. She would later dump him for selling her prized possession Hambo, a raggedy teddy bear that she carried close to her throughout the years of her life that the Ice King was shown in "I Remember You" giving her Hambo when she was young. Marceline has also mentioned her mother, but no in depth information has been given about her or their relationship yet.
In "Evicted!" Marceline says that she had been traveling all over the Land of Ooo, and claims that she has done such adventures as riding Giant Goldfish and traveling to the Fire Kingdom. She has also in the past apparently gained several places of residence.
It's unknown exactly when or how Marceline became a vampire, although she did not have a bite mark on her neck when she was younger. As revealed by her alternate version in Farmworld, Marceline does consider herself half-demon, which may be a major contribution to her longevity. However, this side doesn't give her any magical powers or abilities such as flight and transformation as well as a similar eternal youth to her father, which she appears to have gained due to her vampire powers.

from adventuretime.wika.com