anotheranon | conundrum!

Can someone please tell me why/how this works? Some of you may have already been spammed by this, but I include, in case you haven't:

Subject: age by chocolate...fun one

It takes less than a minute.......
Work this out as you read.
Be sure you don't read the bottom
until you've worked it out! This is
not one of those waste of time things, it's fun.
Go ahead

1. First of all, pick the number of times a week that you would like to
have chocolate.
(more than once but less than 10)

2. Multiply this number by 2 (Just to be bold)

3. Add 5. (for Sunday)

4. Multiply it by 50.
I'll wait while you get the calculator................

5. If you have already had your birthday this year add 1754....If you
haven't, add 1753 ........

6. Now subtract the four digit year
that you were born.

You should have a three digit number .....

The first digit of this was your original number (i.e., how many times
you want to have chocolate each week).

The next two numbers are ..

YOUR AGE! (Oh YES, it is!!!!!)

THIS IS THE ONLY YEAR (2004) IT WILL EVER WORK, SO SPREAD IT AROUND
WHILE IT LASTS.

Calculated, and by doG, it did work, but WHY?