60 something... they made the first PCs! 50 something... First PC OSs and compilers. 40 something... created the first web browsers, and founded the biggest,

60 something... they made the first PCs! 50 something... First PC OSs and compilers. 40 something... created the first web browsers, and founded the biggest, longest lasting Internet companies. Had to deal with C, slow computers, crazy memory mapping, OSes that crash. 30 something... started Facebook, wrote mobile apps, created hundreds of more narrowly focused internet companies using pre-existing tools. 20 something... hack PHP, ruby, js to create sites that deliver stuff to you. Utilize heaps of VC cash. The book is still open what they'll accomplish.