It’s 2021 and Mark was born in 1976 so Mark is 2021-1976 = <<2021-1976=45>>45 years old

Graham is 3 years younger than Mark who is 45 so Graham is 45-3 = 42 years old

Janice is 1/2 the age of Graham who is 42 so Janice is 42/2 = <<42/2=21>>21 years old

# Answer

21
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
It’s February 2021.  Mark was born in January 1976.  Graham is 3 years younger than Mark, and Graham’s sister, Janice, is 1/2 the age of Graham.  How old is Janice?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
21
It’s February 2021.  Mark was born in January 1976.  Graham is 3 years younger than Mark, and Graham’s sister, Janice, is 1/2 the age of Graham.  How old is Janice?
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