They haven't stayed the same. The changes are there, but they aren't dramatic. (They never are while you're constantly looking at them. 'A watched pot never boils.')<p>Look for changes in fashionable colors, in types of fabrics, in shoe styles, in hair styles, even in phone styles and colors, etc, etc.<p>Remember the matching 'His 'n' Hers parachute-fabric tracksuit outfits? Or the bright-colored hair? Or cargo-pants? Or wrist-watches? Or trainer-shoe styles, colors and fabrics? Or the amount of denim? Or checked fabrics? Or spotted fabrics? Or hat styles?<p>A good way to discover the changes is to look at films or music videos made over the years, and look for what stands out as 'different from today'.<p>Get your eye in, and you can pick when a film was made to within a year or two.