As soon as they can use a mouse and keyboard or controller. Seriously though, there's no mature themes in it at all, and if the gameplay is too difficult there'

As soon as they can use a mouse and keyboard or controller. Seriously though, there's no mature themes in it at all, and if the gameplay is too difficult there's always creative mode which is literally digital legos. There's also a multiplayer where they can connect to servers and play with other people. That's where you might want to use some discretion, as the experience will vary from server to server.