Computer technology is about 60 years old, though. There were people doing some pioneering work in the 50s and 60s, and the modern hacker culture really has its roots in the 1970s, just prior to the rise of personal computing.
There was lots of stuff going on with the DEC minicomputers, LISP machines, early UNIX systems, and big-iron mainframes long before most of us were even born, let alone getting our starts on TI-99s, Apple IIs, and Commodore 64s. And let's not forget that the people who were creating those early home-computer platforms were themselves all from the previous generation.
Would you turn people like Steve Wozniak or Al Alcorn or Ken Williams away from your new startup? You'd be a fool if you did. The basic architecture of computers hasn't changed at all since they did their most important work, and the cognitive skillset that makes a great programmer is the same as it's always been.
In fact, I'd expect that people who cut their teeth on early systems, and had to work within narrow constraints, without a big stack of abstraction layers and frameworks, would be all the more adept at writing robust and efficient code than those who learned on modern tools. And I'd bet, with Moore's law slowing down, and with better-optimized code becoming more advantageous in building scalable systems, older programmers will soon be in higher demand.