Just answer. Please don't say that the birth year gives it away. I know that it does and you don't have to remind me, and besides, the whole point is the math trick! I didn't wan't to go this far but If it is wrong it is your mistake because this is coded to be never wrong. And think that every country has a different way of counting ages, so this one is your 'birthday count age'
I got this idea from my math teacher, she introduced the whole trick to me. Korean version shared too. ------------------- 1605 <3 s. 2017.3.20 Thanks to @Joshia_Tanumihardja for letting me know one of the bugs. (New logo/intro,