Cool trick.

[Fish]

Take the last two digits of the year you were born in. Now, add the age you will be this year. For everybody, this will equal 111.

1996 -> 96. I'm going to be 15 this year, September 21st. -> 15 + 96 = 111.

2000 > 00. I'm 11 already, so.. 0 + 11 = 11?! Weird..