It's a Fixed Race
SIMPLE CONCEPT: The leaders of our country can only be six year-olds and sixty-six year-olds. They get one four year term. All presidential candidates must choose a complementary vice president. For instance, if the candidate is a six year-old named Russ, Russ can pick a sixty-six year-old named Hermione.
Why the dichotomy? Six year-olds know the difference between good and bad. Sixty-six year olds have lived the difference between good and bad.