Slow reading advocates seek a return to the focused reading habits of years gone by, before Google, smartphones and social media started fracturing our time and attention spans. Many of its advocates say they embraced the concept after realizing they couldn’t make it through a book anymore. The benefits of reading from an early age through late adulthood have been documented by researchers. A study of 300 elderly people published by the journal Neurology last year showed that regular engagement in mentally challenging activities, including reading, slowed rates of memory loss in participants’ later years. Reading habits have declined in recent years. In a survey this year, about 76% of Americans 18 and older said they read at least one book in the past year, down from 79% in 2011, according to the Pew Research Center.