TOKYO -- Japanese retail investors who have mastered the art of forex trading -- collectively known as "Mrs. Watanabe" -- are getting old, with more than half in their 50s.
Currencies
Japan's aging 'Mrs. Watanabe' could mean turbulent future for yen
Contrarian retail investors serve as check on volatility in exchange rates
The yen weakened to a level not seen in more than 37 years in July of this year. (Source photos by Nikkei)
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