Explaining on Instagram: "Zac Efron first became a global teen idol after starring as Troy Bolton in Disney’s High School Musical. The 2006 television film turned into a cultural phenomenon and launched him into instant fame, making him one of the most recognizable young actors of the late 2000s. At the time, Efron was just 18 years old, and the role defined an entire generation of Disney Channel viewers. Determined not to be boxed into one image, he gradually shifted into more mature and divers