You should be old enough to work the answer out for yourself!
Age Now = Year Now - Year of Birth (if the person has had their birthday this year, and one less if they have not).
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Age in 2014 = 2014 - 1989 (if the person has had their birthday this year, and one less if they have not).
2009 minus 1989 is 20. However, depending on when your birthday is, a person born in 1989 could be either 19 or 20 in 2009. (The older age would be for someone whose birthday had already happened since this is 2009.)
Age Now = Year Now - Year of Birth (if the person has had their birthday this year, and one less if they have not).
The difference in days between the two dates is 1976 days.
On your birthday in 1989, you would turn 27. Until your birthday, you would be 26. This occasionally causes confusion when trying to calculate someone's birth year from their age, if you do not know their date of birth.