If you boot up an Apple II without a disk in the drive (or something incredibly simple like that), it drops into AppleSoft Basic. That's how I learned that one could program a computer. For sample code I could turn to a number of magazines about my computer, or the manual that came with it. No questions or outside research dependent on anyone else (including the Internet) were required. This was when I was of single-digit age. The barrier to entry was tiny (type "10 print hello world" at the command prompt). Nothing like that exists for a curious child at this point unless their parents take the initiative, or the child waits until they're older.