I thought you might ask me that yellow. No, I didn?t teach them rocket science the day they were born. Like everybody else, the day a child is born, (s)he comes with a clean sheet in the brains dept. Many scientists have said a child learns the most on the first day of his/her life and progressingly less and less as each day passes. In other words, the older you get, the less you learn. But does that mean one gets more and more stupid (for want of a better word) as one gets older?
Nope! What one learns, one (usually and hopefully) remembers. The knowledge is accumulated.
Back to ?tutoring? my kids on day one, I merely tried to look in their eyes and catch their attention. The idea is to make the child aware of my presence - another human being. Of course, the child may not even know what is it that (s)he sees in front of him/her at this stage but that is immaterial. The mere fact that (s)he is seeing something is lesson learnt on day one. Lesson progresses in subsequent days, weeks, months and years. One never stops learning!
You are assuming tutoring only involves academic subjects. But like I said, my definition of tutoring involves everything under the sun. When you read to your child, you are tutoring them. When you bathe your child, you are tutoring them, i.e. to keep clean. When you feed your child, you are tutoring them, i.e. hunger needs to be satisfied, etc. When you show your child (for example) another approach to solve a maths question and how it relates to real life, you're tutoring them.
As to how they?d have fared in life had they not been so tutored, well, I dare say for a start, they won?t be so streetwise and self-confident. They probably couldn't have asked me searching questions if something I said didn't make sense to them. They probably wouldn?t have taken an interest in sport and finished their graded piano exams to name but just a few things out of the hundreds if not thousands of things that they have been tutored. They probably wouldn?t have achieved the academic excellence like they did and visited the many countries of the world like they did.