#8. One Direction (Average Age: 18.6) We may never experience Beatlemania again, but British-Irish boy band One Direction are trying their damnedest to replicate that fan-fueled frenzy.They placed third on the UK version of The X Factor in 2010, and have since scored a chart-topping album in the States (Up All Night) and watched "What Makes You Beautiful" become an spring/summer anthem.
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