Rachel's age is 8 x 2 = <<8*2=16>>16.

Collete's age is 8 / 2 = <<8/2=4>>4.

Therefore the difference between their age is 16 - 4 = <<16-4=12>>12.

# Answer

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<|im_start|>system
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<|im_start|>user
Rachel is twice as old as Rona and Collete's age is half the age of Rona's. If Rona is 8 years old, what is the difference between the age of Collete and Rachel?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
12
Rachel is twice as old as Rona and Collete's age is half the age of Rona's. If Rona is 8 years old, what is the difference between the age of Collete and Rachel?
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