The Vice President. The V.P.'s Job: The only duty the U.S. Constitution assigns the Vice President is to act as presiding officer of the Senate. But the Vice President also serves as ceremonial assistant to the President and is an important part of the President's administration.
The ages of middle school students are: 6th grade: 11 - 12 years old 7th grade: 12 - 13 years old 8th grade: 13 - 14 years old.
Most students in the U.S. graduate high school at age 18, almost all in a narrow range of 17-19. Therefore, for traditional undergraduates, the most common age (the statistical mode) is 18. For adults, this is harder to answer.