I am 49; my family moved to Palo Alto in 1972, while in 4th grade. They took us to a room with teletypes (hooked up to a HP 2000 computer) and let us play games on them (Hunt the Wumpus, Hammurabi, etc). In the 5th grade they taught us BASIC in math class (this was back in the days of "new math", which I had no problems with, and am quite thankful for). About this time, I discovered my father was a computer programmer, and decided that was what I was going to do ("You mean they pay people to do this?"). He made some not entirely successful efforts to teach me assembly and COBOL.
In 7th grade honors math class, we learned Minitran (a FORTRAN dialect), from which I learned that programming on punch cards sucked (you submit the program, a week later you get the result back, which usually contained a syntax error). Another student taught a class to his fellow nerds on assembly programming; we had some kind of special nerd room at our middle school which was supervised by Joan Targ (sister of Bobby Fischer, and wife of the infamous SRI psychic researcher Russell Targ; the SRI "ESP testing machine" developed at great cost, and described in The Amazing Randi's book on Uri Geller, was in this room and we played around with it all the time. There was also an unused old analog computer, to which we would randomly plug in banana cables). Jonesing for more computer time, I would hang out at my dads office when I visited him, and also at a local computer store.
By my freshman year in high school (1976), we got access to the school district HP 3000 computer; however the computer lab was closed all year because the current crop of nerds had hacked the machine so badly, they decided to wait for them all to graduate before letting students back on the machine. In my sophomore year they lets us into the computer lab, now outfitted with VDTs and 1200 baud modems (speedy!). I took the only computer programming course, taught by some math teacher, and already knew more than he did so I dropped that. Maybe the year after that, I was put in some kind of program where I went to various places after school (different Stanford labs, once at Xerox Parc) and someone would say "OK kid, why don't you write a program that does this..." and I was exposed to C, assembly, PL/Z, APL and Logo. Back at school, I made an attempt to learn SPL3000, which was hampered by a lack of manuals, or any documentation, so I looked at hex dumps of a library binary to try and figure out how to make function calls. Later we got some early personal computers, I think they were Northstars.