Fan discussions have touched on the recent industry trend debuting younger idols. However, the practice of introducing idols at a young age isn't a new phenomenon in K-pop and has a long history. For example,both began their careers at 14.
While it may not necessarily be ideal, one reason behind this approach could be that starting at a younger age allows idols to enjoy longer careers. Some companies might exclude a trainee from a debut lineup due to their youth, but many still choose to proceed with launching these young talents.
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