CHICAGO (AP) -- Few people would eat a 40-year-old sandwich.
But don't tell that to the (m) millions who flock to McDonald's each year to chow down on a Big Mac.
The triple-decker burger, which helped breed America's super-size culture and restaurants' ever-expanding jumbo meals, is turning 40. The Big Mac was first introduced in 1967 by a McDonald's franchise owner in Uniontown, Pennsylvania.
A year later, it became a staple on McDonald's menus nationwide.
McDonald's estimates 550 (M) million Big Macs are sold each year in the U-S alone. That's about 17 every second.