Wait 'til You're Older

Wait 'til You're Older is a 2005 Hong Kong fantasy comedy-drama film produced and directed by Teddy Chan and starring Andy Lau.

Plot
Chan Chi-kwong (Howard Sit) is a young boy who lives with his father (Felix Wong) and stepmother (Karen Mok). He blames his stepmother for the suicide of his mother 3 years earlier and continually runs away from home. One day, while walking to school, he meets an eccentric old man (Feng Xiaogang) in the park who accidentally pours a magic potion he has created down a drain. The next day, a huge tree has grown from a seedling in the drain. Kwong goes to the man's house and steals the potion, falling and breaking it as he tries to run away. Some of the potion enters a cut in his hand, and the next day he wakes up to find he has grown to the age of 20 overnight. Kwong (Andy Lau) is thrilled that he has become an adult and is able to finally run away from home without being recognized. As he gets older each day, he learns more about being an adult and about the situations of those around him.

Cast

 * Andy Lau as Chan Chi-kwong
 * Howard Sit as Young Chan Chi-kwong
 * Karen Mok as Tsui Mun
 * Felix Wong as Chan Man
 * Cherrie Ying as Miss Lee
 * Gordon Lam as Vice Principal as Chow
 * Chim Pui-ho as Bear
 * Jacky Wong as Billy
 * Feng Xiaogang as Bum, the drifter (special appearance)
 * Li Bingbing as Kwong's mum (guest appearance)
 * Chapman To as Policeman (guest appearance)
 * Kristal Tin as Policewoman (guest appearance)
 * Nicola Cheung as Miss Wong (guest appearance)
 * Simon So as Jack, the basketball team captain
 * Joe Cheung as Joe
 * Lee Yee-man as Beer lady