A few exceptions. I never tried to reach the top speed of my 1971 Dodge Demon with its 3 speed slant 6 engine back in the days I was a teenager. Probably would have barely topped 100. As an adult, I was and still am too afraid to test the top speed of my 2 Porsches (160 and 161). Driving 135mph in a convertible Porsche, on one occasion when 40 years old with my first Porsche, was enough to put the fear of God in me. The real difference, then to now, was that in the 70s teenagers would routinely drive drunk. MADD put a stop to that by the early 80s.