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If anything, these youngsters bringing in a younger audience helps the sport grow and brings the average age viewer down, which is good. You don’t want the average age of a sports fan ti be increasing every year.
Link please. . I have seen absolutely no evidence that younger athletes bring in younger fans, controlled for variables of country, sport, etc.
Also, age of majority in Eastern hemisphere countries: Japan: 18. South Korea: 20. (ETA: according to Google, I have no actual knowledge.)
In Western Hemisphere places like Moscow, (since some of Russia is in the Eastern Hemisphere), other places in Europe. North America, South America, it varies.
"Western" as a political construct is meaningless for me, because it is so variable and not agreed upon, so I use the actual geography for standards in the East and the West.