In a nutshell:
n= number of times you eat
y = year you were born.
If you had your birthday then you 'll end up with 100n + 2009 - y
If you had not had your birthday then you'll end up with 100n + 2008 - y
Subtracting your birth year from 2009 / 2008 (depending on your birthday) will give your age (2 digits) so you'll end up with n(age).
This will NOT work if you are over 100 years old, though (heh, it's not Y2K compliant!).
Which will give that result.
You can make it work next year, too, just change 1759 and 1758 to 1760 and 1759 (respectively).
