Dream a Little Dream (1989)

Bobby has everything a young guy should: a good buddy, a girlfriend, and parents who love him. When the older couple down the street try a transcendental experiment to extend their lives, they quite literally become trapped in the teen's bodies. This teen comedy has a great cast including the two Coreys – Corey Haim and Corey Feldman, as well as Harry Dean Stanton ( Repo Man, Alien ), Piper Laurie ( Carrie ), and Jason Robards ( Magnolia )