Board Thread:Questions and Answers/@comment-1398428-20140913004747/@comment-14250-20161009065229

> Rosalina's older than Peach, huh? In Rosalina's storybook, it said that her parents are dead. Yet, we see Mario and Peach are alive and well. Does that make any sense?

It does when we remember that time travel is a thing in various incarnations of mario:
 * Mario's Time Machine
 * Mario & Luigi: Partners in Time