How old was Zac Efron in High School Musical one?

Related questions

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2. Are Zac Efron and Vanessa Hudgens back together?
3. Why is Zac Efron famous?
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5. Did Zac Efron sing Greatest Showman?
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2. #including
3. #franchise
4. #meteoric
5. #perry
6. #appeared
7. #matthew
8. #starring
9. #films
10. #school
11. #several
12. #musical
13. #efron
14. #years
15. #again
16. #following