The Scheme of today is extremely different from the Scheme of 40 years ago. Comparing the language of R0RS and R1RS with R5RS, you'll see just how different they are. I'd say that "modern" Scheme is due more to Clinger than to Sussman & Steele!
My point is that, yes, Scheme as a concept originated in the mid 70s, but it has been updated many times over the years. The Scheme of today isn't 40 years old.
My point is that, yes, Scheme as a concept originated in the mid 70s, but it has been updated many times over the years. The Scheme of today isn't 40 years old.