Final answer:
The birthday rule determines primary policy based on the parent whose birthday comes first in the calendar year, not by who is the oldest.
Step-by-step explanation:
The statement that the policy of the person who is the oldest is considered primary under the birthday rule is false. The birthday rule is a method used by insurance companies to determine the primary and secondary coverage when a child is on two parents' health insurance policies. According to the birthday rule, the policy of the parent whose birthday (month and day, not year) occurs first in the calendar year is deemed the primary policy for the child.