it means
revealed your age. Culture and other phenomenon change from generation to generation. Typically people are familar with the songs learned when they were young. For example, Beetles fans are typically people in their 50s-60s. So when you say you are a Beetles fan, you have "dated" your self to others.
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• Thank you, bmdn, for the explanation -同学小薇- ♀ (0 bytes) () 04/10/2013 postreply 15:13:02