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It's no secret that Korean's -- and much of the Asian population in general -- age well. But how does your typical westerner fare when it comes to identifying the ages of Korea's leading actors?
YouTubers BeasTWO ventured out into the streets of Seoul to speak to US expats and visiting tourists to see if they could guess the ages of the likes of Song Joong Ki and Yoo Ah In.
The results were, um, interesting to say the least, with guesses going as low as nine-years-old (!) to a maximum of just 24! (It's worth noting that Korean ages are used in the video, which are usually work out to 1 or 2 years higher).
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Check out the video below and tell us how well do you think you would have done?