Few cars posses a style that can hold up over a single decade, let alone multiple decades. One of those cars is the Porsche 911. The 911 has certainly evolved since its introduction in 1963, but the sports car’s basic profile and proportions remain unchanged after more than 50 years. I’d argue that at this point Porsche can’t change the 911 without risking a massive revolt from the car’s dedicated fanbase.
I’d make the same argument about the Dodge Challenger. Unlike the Porsche 911, the Dodge Challenger doesn’t have 5 decades of uninterrupted production. Dodge’s muscle car was only in production for 5 years before it vanished for 35 years (and no, the Mitsubishi “Challenger” from the 1980s doesn’t count…).