160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! WASHINGTON – More than 26 million people worldwide have Alzheimer’s disease, and a new forecast says the number will quadruple by 2050. At that rate, one in 85 people will have the brain-destroying disease in 40 years, researchers from Johns Hopkins University conclude. The new estimates, being presented Saturday at an Alzheimer’s Association conference in Washington, are not very different from previous projections of the looming global dementia epidemic with the graying of the world’s population. But they serve as a sobering reminder of the toll to come if scientists cannot find better ways to protect aging brains.