If Peter's age is currently half of his mother's age, who is 60, Peter is 1/2*60 = <<30=30>>30 years old.
In four years, Peter will be 30+4 = <<30+4=34>>34 years old.
Since Peter's age in four years will be twice Harriet's age, Harriet will be 34/2 = <<34/2=17>>17 years old in four years.
Currently, Harriet is 17-4 = <<17-4=13>>13 years old.
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