Ah excuse me sweets you are as young as you feel - look at me, I don't feel a day over 60. Btw I always tend to forget my birthday (and everyone elses) until someone has to remind me so it seems everyone except me is celebrating my birthday.
On a more serious note there are two scriptural references to birthdays but not in the context of celebration, I would agree with the consensus that there is no biblical reference to not celebrating one's birthday.
In the event that the PM talks about "pagan" in the sense that people have been celebrating their birthday's long before the birth of the Master then he is right and if we use the 25th of December as the day of His birth (which is probably erroneous) then what does it matter - it is a great matter for celebration.
Sorry, wandering off the subject matter again................