We did it with a homeschool group. The house smells pretty yucky while the cabbage boils, but it is a GREAT experiment.
We also did a solubility experiment at roughly the same time (age 6y4mo or so), and it was a hit with both DS6 and DS3. I let them pick what they wanted from the kitchen and we hypothesized if it would dissolve in water or not. If I had it to do over, I'd add other solvents, too, but it was my first official science experiment using science terminology and everything, so I was pretty pleased with how it turned out.
Fun!
