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Here is what Sita says to Ravana in aranya kanda(sita says that when Rama left ayodhya for exile,Rama was 25 years old and sita says she was or is 18 years old.
मम भर्ता महातेजा वयसा पंच विंशकः ||
अष्टा दश हि वर्षाणि मम जन्मनि गण्यते | (Aranya Kanda 47 Sarga 11 sloka)
"My great-resple...