- Think of a number from \(1\) to \(9\).
- Multiply this number by \(9\).
- Calculate \(10\) times your age.
- From the value obtained in point 3 subtract the value obtained in point 2.

The result is a number of \(2\) or \(3\) digits. If it has \(2\) digits, add them up and get your age. If it has \(3\) digits, add the first number that has \(2\) digits with the second that has \(1\) digit and you also get your age!

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