Final answer:
The holder of a private pilot license under 40 years of age must pass a medical examination every 60 months or 5 years to maintain their licensure.
Step-by-step explanation:
The question pertains to the regulatory requirements concerning the health of pilots. Specifically, for a private pilot license holder who is under 40 years of age, the Federal Aviation Administration (FAA) requires that they must pass a medical examination every 60 months or 5 years to continue flying. It's important to maintain this medical certification to ensure both personal health and public safety while operating an aircraft. The intervals for these examinations are different for various types of pilot certifications and can also vary based on the pilot's age.