What are some excuses to make in front of girlfriend for forgetting her birthday?

My favorite

Who remembers your birth day…You never go old!
Birth day! Are you sure you were not fallen from heaven…Oops I have been misinformed…!
I didn’t forgot your birth day but jaan, I just couldn’t use my brain in front of you…I go blank…!
You never look older to me…You are sixteen since you were sixteen…!
Do I have to remember your birth day in reverse chronological order also…You are aging down…!
I remember only my birth day…the day I met you…!
Okay so you were born of Feb 28,but my reminder said Fab 28…oops error of signs!
For Jan , use Jaan 28 or for March used Marv(elous) 28, etc.
I forget to breathe when I see you and you are asking about damn birth day…!