Essay mistakes: Should a 16 years old vote in national elections?

1) Correct the mistakes in the following sentences:
1. The youngs have the right to vote.
2. The children isn't worried about politics.
3. We are in the 21th Century.
4. People who have 16 years old must learn about political parties.
5. The teens aren't mature enough to vote.
6. I think that vote in national elections should be for 18 years old people.
7. Who you should vote?
8. She knows many about the country.
9. Teens should demonstrate her education.
10. If a teenager hasn't knowledge about the country problems, he shouldn't vote.
11. They vote for her fathers.
12. Teens usually are rebels.
13. She is older than he.
14. Somebody should read the newspaper when they want to learn about social issues.