Computer games and programs for learning skills such as graphical design and math programs are fine. I don’t see any reason for someone that young to be on the internet.
There are lots of great websites for kids
www.enchantedlearning.com
There are several great ones for helping kids learn to read, but I forgot what those are.
My kids have been on the internet for a long, long time.
We just set up the computer in a shared location, and didn’t put it in their rooms.