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It's not really difficult:
Note that
5 * 50 = 250 and
1755 + 250 = 2005 (seem like a familiar number?)
When you subtract the year you were born from 2005, you are of course going to get your age.
The number you chose is multiplied first by 2, and then by 50 - i.e. in total, by 100, so it will appear as the first digit of a three digit number.
The thing will will still work in 2006, except I guess you should substitute 1755 for 1756 (or 1754 for 1755 if your birthday is yadda yadda yadda).
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