Is one's Jewish birthday a day of עת רצון (time of will) regarding prayer?
Is there a source for giving berachos to people on one's birthday?
Partial answer to #2 from here :
When a person is born, Jewish mystics believed, the skies part to enable his or her soul to come down to earth. On each birthday, the skies open again, giving the celebrant one-day access to heaven for his or her prayers. The birthday boy or girl should thus bless as many people as possible.
If you are asking this b/c your own birthday is coming up, I'll relay what my grandpa a"h said (who lived to 93): He only wanted to live until 118, so this way he could worry about what to do when he got old.