my day today

here's a short and simple brain exercise.

caution: i'm not a math genius. if the equation is quite vague, well Newton and Archimedes is just a text away.

so heres the problem:

2 x (y + m) = n

if : y=8 and m =10

what's that for? i'm having MY BIRTHDAY TODAY! if only someone can remind me of my age cause i feel i'm like in my twenty-isshhhh..

you may or may not solve the problem given above. if you've got the answer, well just keep it secret. 
i'm not that old right?