Nanako Dojima in Persona 4 is 6 years old and she helps her father out by doing household chores and making breakfast (sunny side-up eggs with toast). Don't see what's wrong with video game characters unable to do something when they are 6 years old.
My ten year old step daughter can make eggs and coffee. She's been able to run the coffee machine for about 3-4 years now. (Her good-for-nothing father was usually too drunk to actually wake up and make breakfast so she had to do it for him in the mornings.)