The world premiere of “A Life Unhappening” will meld choreography with the written word for a spoken-word ballet performance exploring the impact of Alzheimer’s disease on three generations of one woman’s family. The St. Louis Chapter of the Alzheimer’s Association has teamed up with writer and producer Adam E. Stone for the performance, which will begin at 7:30 p.m. May 11 at the Blanche M. Touhill Performing Arts Center at the University of Missouri–St. Louis.