Title

1st Paragraph
Introduce the topic and state your opinion. You can ask a question. 

While many people may think that minors should not vote I personaly think that.....
Some people think that...  In my opinion...

2nd Paragraph
Give an argument to support your thesis. You can explain some relevant facts.

There are several reasons which support my opinion.
Firstly,...

3rd Paragraph
Add another argument to support your argument.

Secondly,...

4th Paragraph
Conclusion. Restate your opinion using different words and suggest what should be done.

In conclusion/ To sum up I personally consider that because.