For some of the Jrockers (or celebrities in general) part of their mystique is that they look ageless. If they revealed how old they actually are, it may result in a lot of unnecessary speculation as to how they maintain their appearance and take the focus off of their music or career. For others, especially in the VK realm, it may be to prevent an onslaught of "You dress that way and you're HOW old?" and expect them to grow up or act their age. Or, people would just find it creepy that a mature person would wear some of the outfits VK artists wear.
It can also take pressure off of the younger artists. Imagine a new group emerges on the scene, and they are incredible. They're extremely talented, their songs are great, and everyone is excited with their potential as a band. If word got out that they were all 18 years old, people would start expecting more from them as they continue. Instead of just being a hot, new band, they become the hot, new, YOUNG band with a bright future and many years of incredible music ahead of them. Suddenly the pressure to be better than they just were increases exponentially. Had they kept their age under wraps, it's quite possible that the whole expectation of them being around and active and awesome for a long time would not be as immediate.
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