Talk about a generational divide. While only 43 percent of all Americans with wireless service have a smartphone, the majority of younger Americans own such gadgets, according to new data from The Nielsen Company. According to Nielsen, 62 percent of adults with wireless service aged 25-34 report owning smartphones, and among those 18-24 and 35-44 years old the smartphone penetration rate is around 54 percent. In contrast, 40 percent of 45-54 year-olds reported owning a smartphone, as opposed to a more basic feature phone. Google's (NASDAQ:GOOG) Android remains the most popular smartphone platform in the United States according to Nielsen, with 43 percent of the market, while Apple is the top smartphone manufacturer, with 28 percent of smartphone consumers using an Apple iPhone. Post