It is worth asking yourself if you are sure you were born on your birthday? 

Thich Nhat Hanh explains his insights into Buddhist teachings on being born and dying.

"On our so-called birthday, instead of singing Happy Birthday, we can sing Happy Continuation Day. It’s closer to the truth. Happy Continuation Day. The day of conception is also a continuation day. The day of birth is also a day of continuation. And how about the other days? We have already spent many days—twenty years, thirty years, fifty years, eighty years already, and how can we call these days? All of them are continuation days. And we die and we are reborn every day."