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Missouri currently has no law that states a minimum age. Georgia, Illiniois, Maryland and Oregon are a few of the states with very specific ages. Typically 8 year olds and over can be left at home for up to several hours (usually after school before a parent gets home from work). 12 years old appears to be the most common recommendation. http://www.latchkey-kids.com/latchkey-kids-age-limits.htm provides a state by state comparison.
The intent of this new law obviously is to make Missourians more safe because lowering the CCW age to 19 will qualify more people to walk around armed and letting teachers bring concealed weapons into schools will also protect the children and other teachers when a bad guy with a gun comes into the school.