I'm 31. Late August will be my 32nd birthday. Actually, my 33rd. I mean, the day you are born would be a birth day, right? Man, this system is weird...
Funny you mention that, Harlock. I think, I heard this somewhere so don't quote me, that in China, your age also includes the nine months before being born. So actually, the date of your conception is your true birthday. Interesting.