Final answer:
The oldest flag is that of Alaska, which features the Big Dipper and the North Star.
Step-by-step explanation:
The oldest flag is that of Alaska, which was created in 1927. The winning design was submitted by Benny Benson, a 13-year-old boy. The flag features a dark blue field with the Big Dipper constellation and the North Star, representing Alaska's location and connection to the northern hemisphere.