I let all 3 of my children play video games from the moment they first shown interest. Each of them were reading and typing at a 5th grade level before they were in school.
Years later they even became better at typing than me. And my oldest knows the basics of programing and computer repair( he's 10 btw)
I LOVE THAT!
Your kids sound so gifted!
I really admire that, when kids are so talented at such a young age.