The Magical Computer age cards

Items: You Have 6 card that will help you do magic.You can tell the age of anyone from 1-60. Magically.

Method: It's really simple First,tell a person to choose the cards which contair his age.
                Then add the number on the upper left corner of each of those cards.There You have got answer.


For eg. :  If the person is 30 years old, he will choose those 4 cards which have the number 30.The upper left number of these cards are 2,4,8, and 16.total?