Is anyone homeschooling their kids? Can you please share on your experience and at what age should I be starting if I want to home school my kids?

I know some parents here in Sweden who home-school their kids and they start as early as 3 and usually stop as soon as they reach the age for elementary school (around 7). I know one mommy who home-schooled her daughter till she was 12 but personally, I wouldn't go that far. I think it's important to introduce children to mainstream education when they are of age as this will help them prepare for higher education. Reckon home-schooling should be kept to the nursery, pre-school time-frame.