My 7 year old finished Zelda several times without a lot of help (mostly early on we helped to show how to cook, etc) ... I do recommend Super Mario odyssey or Lego City though - may be more age appropriate.
Odyssey is what we just started playing, the two player is perfect because he can just control the hat, and we work together. He's just never played many video games before, apart from some Roblox. Lego is what I probably should have gotten. I bought the Pokemon game because he liked the fighting, but there's way more to it than I thought.