Denise is 25 - 2 = <<25-2=23>>23 years old now.

So, Diane is 23 - 4 = <<23-4=19>>19 years old now.

Diane will be 25 years old in 25 - 19 = <<25-19=6>>6 years.

# Answer

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<|im_start|>system
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<|im_start|>user
Denise will be 25 years old in two years. Her sister, Diane, is 4 years younger. In how many years will Diane be 25 years old?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
6
Denise will be 25 years old in two years. Her sister, Diane, is 4 years younger. In how many years will Diane be 25 years old?
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