Ages
The same idea shows up four times, at four different ages, and gets harder every time. A five-year-old colors a website. A twelve-year-old builds one. The subject never changes. The demand does.
That repetition is deliberate. A concept met once at five and again at nine and again at twelve is not three lessons. It is one lesson that had eight years to settle.
Crayon Years, ages 3 to 6
Coloring books. Thick outlines, one idea per spread, and a decision on every page that the child makes with a crayon instead of an answer.
What gets introduced here: being findable, trading, spending less than you take in, the idea that a computer learns by looking at examples, and the idea that some things you own cannot be held.
What a finished page looks like: two lemonade stands, one busy corner, one empty back yard, and the question of which one sells more.
Question Years, ages 6 to 9
Activity books. Matching, counting, sorting, sequencing, and the first real why questions. The child is no longer only choosing. They are being asked to explain the choice.
What gets introduced here: why people search for things, what a name on the internet is and why it costs money, how a price is decided, what makes an example good or bad for teaching a computer.
Builder Years, ages 9 to 12
Project books. Something exists when the book closes. A page, a list, a small plan written in the child's own handwriting.
This is where the subject stops being a story about somebody else's lemonade stand and becomes the child's own thing that other people can look at.
What gets introduced here: making a real page, choosing a name, writing so somebody else understands it, and the first honest look at why some things get found and others do not.
Founder Years, ages 12 and up
Business books. Price it, sell it, keep the receipts, and be able to say where the money went.
At this age none of it is metaphor anymore. A twelve-year-old can genuinely run something small and real, and the failure modes are the same ones adults hit, at a scale where the lesson costs eleven dollars instead of eleven thousand.
What gets introduced here: margin, demand, owning something that earns while you are asleep, and the difference between being busy and being paid.
And the shelf for the grown-ups
Separate line, separate audience, and the only place the jokes are allowed to live. The Asian Parent's Guide To The Universe sits here, along with the rest of the material written for whoever is holding the crayon box and quietly learning this stuff for the first time too.
Where a child should start
At their age band, not above it. The books are built so that the older band assumes the younger one without requiring it, which means a nine-year-old starting fresh in Question Years is not behind, and a six-year-old handed a Builder Years project book will be frustrated rather than advanced.
If you are unsure, start one band below where you think they are. Being early with the concept is the entire point of this project. Being early with the difficulty is just a bad afternoon.