Matthew Perry will play the grown-up version of 'High School Musical' star Zac Efron in a new comedy.Matthew - who shot to fame playing Chandler Bing in the hit US TV show 'Friends' - will be exploring his childish side when he wakes up to find he is a teenager again in age-switch film 'Seventeen'.In a bid to find out exactly what goes on in his children's lives, the newly-young character, played by Zac Efron, sneakily enrolls at their school.Meanwhile, Zac's character has to deal with waking up to find himself a middle-aged man with a wife and family.Leslie Mann, who recently appeared in unlikely hit 'Knocked Up', will play Matthew's character's wife Scarlett in the New Line film.While Matthew has found success with his role in new sitcom 'Studio 60 on the Sunset Strip', his film career perished when he starred in flops including 'The Whole Ten Yards' and 'Serving Sara'.This will be 20-year-old Zac's first lead role in a film outside of the hugely popular 'High School Musical' series.As well as starring as basketball-playing Troy Bolton in the films, Zac also acted alongside John Travolta and Michelle Pfeiffer in the recent film remake of musical 'Hairspray'.'Seventeen' is expected to be released in 2009.