Salam..
B.days celebration according 2 existing fashion... This is objectionable in Islam.
If U celebrate ur b.day by offering prayer 2 pay thanxx 2 ALLAH that He made u
ppl with full swing or by giving some charity in the way of ALLAH in the capacity of thanx 2 ALLAH ALMIGHTY. It would not be objectionable...so, let me tell u 1 thing crystal clear that every act what may be, is celebrated acording 2 the rules n regulations formulated by ALLAH and exercised by ALLAH's Rasoul (sal-Allahu 'alayhi wa salam) would a virtue rather than sin.
PRaYeRsss...