Raising my own kids has given me a brand new appreciation for the complexities of teaching kids. Before my boys were toddlers, I somehow had the delusion that you could sit a pre-schooler down with a worksheet and they'd happily follow directions and magically learn the lesson. (I laugh at naive past-me). Now I'm more aware of how you can tell a child something and it takes many, many repetitions and a great deal of parental patience before that concept is absorbed. I'm so glad that I've gotten to experience first-hand how teaching a child to read (or math, or potty training, or anything!) has worked 'in real life'.
My own kids, (in a very biased observation), are pretty intelligent. My oldest is nearly four and can read simple sentences pretty fluidly. That's both a blessing and a curse for a person who'd like to develop a homeschooling program. On one hand, I actually taught my son to read with zero help from any program, so I should be able to tell another parent how to do the same! But, on the other hand, I could have skewed expectations if my child learned at an unusually accelerated rate (which, reading at age 3 could possibly indicate).
Without a larger sample size, I have no way to know, but I ended up concluding that the same technique I used to teach my kids will work at any age, whether 2 or 102. Therefor, I plan to proceed and hope for feedback in the future to gauge the age appropriateness of my lessons.