Wang Gang asked Teacher Zhang how old he is this year. Teacher Zhang said: "When I was your age, I was five times your age. When you were my age, I was already 52 years old." How old is Teacher Zhang now?
王刚问张老师今年有多少岁．张老师说："当我像你这么大时，我的年龄是你年龄的5倍．当你像我这么大时，我都已经52岁了"．张老师现在多少岁．
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