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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In 2013, someone born in 1999 would turn 14, and on their birthday would be 5114 days old. (365 days x 14 and four leap days for 2000, 2004, 2008, and 2012) In 2014, on their birthday they are 5479 days old. In 2015, on their birthday they are 5844 days old In 2016, people born before March 1 would be 6209 days old on their birthday, while people born on or after March 1 would be 6210 days old (picking up the leap day on February 29).
On your birthday in 2017, you would be 11 years old.
You can be either 42 years old (if your birthday has already occurred in 2009), or 41 years old (if you have not had your birthday yet in 2009).
Assuming you had not yet celebrated your birthday, you would be 16 years old. Assuming you had celebrated your birthday, you would be 17 years old.
Assuming you had already celebrated your birthday, you would be 12 years old. If you had not yet celebrated your birthday, you would be 11 years old.