News By Matt Egan, Annalyn Kurtz,Allie Schmitz and Jen Tse, CNN Business The longest bull market in American history turns 11 years old on Monday. Monday, March 9th 2020, 3:45 AM HST Updated: Monday, March 9th 2020, 3:45 AM HST By Matt Egan, Annalyn Kurtz,Allie Schmitz and Jen Tse, CNN Business The longest bull market in American history turns 11 years old on Monday. But investors are hardly celebrating.