By Alex Lang New York (Knewz) — New is old again, or old is new, or old is popular. It’s one of those sayings. No matter the idiom, one thing is true — vintage is cool when it comes to car buying for younger adults. A recent survey by Ally Financial found 71 percent of consumers between 18 and 40 years old would rather buy a used car than a new one. Sustainability was the key factor for that age group as 63 percent said they prefer used because it draws on future resources than building a new car, Ally found. “Sustainability has become a key priority for Gen Z and millennial consumers, and it’…