Have a go ...

Pick No of times per week you would like chocolate More than 1 be less than 10...

x by 2 then add 5 Multiply Answer by 50...

If you have already had your birthday add 1755 if you haven't add 1754. 

 Now Subtract the four-digit year you were born

You should have 3-digit number.

The first digit was your original number (i.e. how many times you want chocolate each week...

The next two numbers are your age (Oh yes it is)

This is the only year it works so spread it around while it lasts

love from Jean W.