Don't have kids yet, but I started playing at age 5, didn't notice any issues (although that may be in the eye of the beholder, ha)
I actually think video games did me a decent amount of good with reading and math skills. Lot of RPGs, minecraft, etc. I would definitely set time limits and try to push towards more "brainy" games
Yeah. Although it was good that I quit when I did, my time with world of Warcraft when I was 9 leveled up my typing and communication skills so fast. Since I'm particularly prone to min/maxing I also got some good experience with math and unintuitive systems and how to guage what was better. (Percent increase vs flat increase, hit speed vs hit damage, etc.)
I actually think video games did me a decent amount of good with reading and math skills. Lot of RPGs, minecraft, etc. I would definitely set time limits and try to push towards more "brainy" games