American boomers now a $2 trillion market From stocks to sex, marketers target a big-spending demographic Every day in the U.S., 10,000 baby boomers celebrate their 50th birthdays. Their generation spends $2 trillion a year. Mindful of that spending, every marketer worth his or her MBA is pitching to them -- everything from new makeup lines for women who burned their bras, to age-friendly technology, to "active adult" communities, to sex. In the coming week, CNBC will take a look at the businesses and industries that are targeting this market segment -- and how well they're faring. Some 78...