A bit more than 50 years. Grace Hopper retired in 1966. It's true that Grace kept un-retiring, but the most crucial stuff is all before she retired. Invention o

A bit more than 50 years. Grace Hopper retired in 1966. It's true that Grace kept un-retiring, but the most crucial stuff is all before she retired. Invention of what we'd think of as a linker-loader (which Grace called a compiler) and of the broad concept of high level programming languages all happens in the 1950s.