Final answer:
The onset of panic attacks can vary, and it is best to consult with a healthcare professional for a proper assessment and treatment plan.
Step-by-step explanation:
The exact onset of Jane's panic attacks can vary from person to person. Panic disorder typically develops in late adolescence or early adulthood, but it can start at any age. The initial panic attacks may occur suddenly and without warning or they may be triggered by certain situations or events. It is important for Jane to consult with a healthcare professional to assess her specific case and determine the best course of treatment.