Kids can use the stove and oven
When both parents are working, kids in the 60s would find themselves home alone for hours. Unless their mothers were able to find time to prepare their dinner ahead of time, these kids often had to learn at a young age how to cook their own dinners.
Source: Herald Weekly
It is not surprising to find a little kid knowing how to cook back then. Today, it would be a real surprise to have a kid that knows how to operate a microwave at a very young age or a kid who could survive making their own dinner.