Disclaimer: I did not come up with this myself, but found it on Moda Lissa
There are four unusual dates this year. 1-1-11, 1-11-11,11-1-11, and 11-11-11. Now take the last two digits of your birth year and add to the age you will be this year....
What is your answer? My baby was born last year, meaning she'll be 1 this year...so 10 + 1 = 11.
Strange, now you try! It worked for my whole family that we were all ones!