How is that for a cool movie idea?
The movie ["Boyhood"] tells a story of two divorced parents (Hawke & Arquette) trying to raise their precocious child (Salmon). It will span 12 years, beginning when the child is 6 years old and ending around the time he graduates high school. 
Director Richard Linklater started shooting in 2001, but the movie will not be out until 2013. That will make the aging effects very realistic, because, well, they are real.