This is true every year. It's the same thing as 2011-1990= 21 years, only your counting 2000 as 100 and so on. So of course 11 years after 2000 where 2000 counts as 100 will be 111.This year has 4 unusual dates 1/1/11, 1/11/11, 11/1/11, 11/11/11. Take the last 2 digits of the year you were born plus the age you will be this year. It will add up to 111.