As California farmworkers age, a labor shortage looms. The aging workforce reflects a convergence of trends. In many cases, the children of farmworkers have little interest in field work. Tighter U.S. immigration enforcement, as well as brutal cartel-driven violence along the Mexican border, have deterred many potential workers from attempting to cross. And, amid a rebounding economy in Mexico, Mexican farms are facing their own labor shortage and have plenty of work to offer at home.