Find one's age from number of choclates one eats!

In the last 2 weeks, I have learnt a new technique: of guessing someone's age from 2 parameters:

1. Number of choclates one eats
2. A little help from the same person in doing some maths

Yes, seriously... I am not joking... Let me share this technique with all of you...

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) --- You will tell me only this number. Rest all is done by you without showing to me!
2. Multiply this number by 2.
3. Add 5.
4. Multiply the result by 50.
5. If you have already had your birthday this year add 1759. If you haven't, add 1758.
6. Now subtract the four digit year that you were born. You should have a three digit number - Now tell me only this last 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!!!!!).