To do this activity it's expected you understand the content covered in the following:
On a birthday cake we often use one candle for each year of age.
But since each candle can be either lit or not lit, we could use them to show a binary representation of your age. For example, 14 years old is 1110 in binary, so you could represent it with four candles.
Persuade people to start using binary candles on their birthday cake.
(By the way, the traditional system is called unary, or base one. Each candle is worth one times as much as the previous one!)