I'm pretty sure it's supposed to be the time when you were born, but most people would say that you would age by noon.
When you turn 13, you are officially 13 years old for the full 365 days until your next birthday when you turn 14.
You turn 15 on your birthday in 2013. You turn 16 on your birthday in 2014. You turn 17 on your birthday in 2015.
You turn 15 on your birthday in 2013. You turn 16 on your birthday in 2014. You turn 17 on your birthday in 2015.
If you turn 18 on your birthday in 2013, then you were born in 1995.If you are 18 when 2013 begins, and then turn 19on your birthday,then you were born in 1994.
Since age is done by the date only (individual times would be impossible to regulate) then you can do whatever you are allowed to do at that age, as soon as it is the date of your birthday - the date changes at midnight, so you are 21 as soon as the clock reaches that time.
On your birthday in 2012, you would turn 31. On your birthday in 2013, you would turn 32.
On your birthday in 2012, you would turn 31. On your birthday in 2013, you would turn 32.
On your birthday in any given year, add 2 to the last 2 digits of the year. You turn 15 on your birthday in 2013. You turn 16 on your birthday in 2014. You turn 17 on your birthday in 2015.
It is called your "Beddian" birthday! :)
Someone born in 1973 will turn 38 on his birthday in 2011, and 39 on his birthday in 2012.
In 2011, you're 20 until your birthday, and on your birthday, you turn 21.
You turn 32 on your birthday in 2013.