What is your age?

162.

15 :p

40 :-(

A few days ago

I am 15

20

My age? A number. :D

I don't mind telling you but you're going to have to put in some effort. Work your way through this little verse then subtract 3 and you'll be right on the money.

A dozen, a gross and a score
Plus three times the square root of four
Divided by seven
Plus five times eleven,
Gives nine squared, that’s all, no more.

26