Wait 'Til You're Older 2005

Twelve-year-old Kong is an unhappy child. He has not been happy since his mother's suicide three years ago, which he blames on his father and stepmother. He runs away from home one day and meets an eerie old man who claims he has a potion that can speed up the life process. As much as he would like to believe it, this is all baloney to him. So when he accidentally taints his blood with the potion, he hardly expects his fate is about to change forever. It is an impossible dream come true when Kong wakes up the next morning to find himself already a twenty-year-old young man.