Assuming that nobody kills her , doesn't get any life threatening diseases or fall into the ocean. Basically I'm asking if she can die of getting old seeing that she can manipulate her age.
R we shipping this nowit's all about your organs and cell renewal, if she can keep that healthy she can in theory live forever.
Together with Law they can both live forever if he fixes them up when they get sick with medicine or operations and she can keep them young.