I was just discussing this with my wife as my 6-year old daughter developed an interesting grip (not shown in any of those pictures). With humans being creatures of habit, I'm curious if there is generally a certain age where the grip should be corrected, especially if it looks like a straining one. I remember having a co-worker who held her pen in her fist, like she was writing with a boxing glove on (puts all the strain in the arm, elbow & shoulder).