Final answer:
No, an 80 year old person who became a U.S. citizen at age 21 cannot become president.
Step-by-step explanation:
No, an 80 year old person who became a U.S. citizen at age 21 cannot become president. According to the U.S. Constitution, the requirements to become president include being at least 35 years old. Even if the person became a U.S. citizen, they would not meet the age requirement at 80 years old.
Learn more about U.S. presidency