As the population ages and people live longer in bad shape, the number of older Americans who fall and suffer serious, even fatal, injuries is soaring. So the retirement communities, assisted living facilities and nursing homes where millions of Americans live are trying to balance safety and their residents' desire to live as they choose. Those who study and manage retirement facilities and nursing homes say there is heightened attention to preventing falls. Trying to anticipate hazardous conditions, retirement facilities like The Sequoias hire architects and interior designers, some of whom wear special glasses that show the building as an old person would see it.