In mb, school age is 5 if they're in full day kinder, if they are in half day kinder then school age is as soon as they "graduate" from kinder, or turn 6.
We have similar laws about under 2. It's two under two if you're private. You can have 3 under 2 if you're licensed. Currently, I have two 1 year olds and 3 2 year olds. And on in service days, I have my oldest daughter (5) and another school age child.