I really liked how each colored area also included fun drawings. This visual really helped the kids remember which part of the brain completed various functions.
The cutting was very simple. I think it would be fine for kids age 5 and up.
After cutting the specific lines, we formed two shallow "bowls" which were actually each hemisphere of the brain. Then we attached the hemispheres with tape.
Here is a left side, back, and right side view of the brain hats.
We also had fun with this list of words. You have to say the colors you see as fast as you can. It is harder than it looks, since the words are "color words" but not typed in the correct color. If that made any sense at all...
I will leave you with this gem of a picture. It pretty much says it all!!! :)