[jslabovitz]

I did this too! Not on a notepad, but on a Royal typewriter, age 10. My dad had a telecommunications consulting business, based on a remote Univac mainframe he rented time on. He'd bring his Texas Instruments Silent 700 printer-terminal home from work, and I'd sometimes get to play Adventure and what-not if he wasn't using it. I vividly remember typing my first BASIC program on the typewriter, one afternoon after school, and then waiting excitedly for him to get home so I could actually type the program into the terminal. (Pretty sure the program was: 10 PRINT "HELLO" / 20 GOTO 10.)

EDIT: This would have been ~1976.