:salam2:
Well, Birthday is celebrated in all types of cultures (i guess) but one thought is always come in my mind that why we lit number of candels on birthday cake as well as burn-off it by blowing before we cut the cake? Do you have any answer 
In my view, we lit numbers of candels and then we quench it by taking its meaning that ‘oky Sir! you lived this much years and if you are lucky enough to stay alive one more year then again you to repeat the same with one more addition of a candel’. 
What you say guyz 