Snooks, I wouldn't think your daughter is too old to start on something like that. Did you read all the various articles? She'll be right brain dominate until age seven. . . thats plenty of time! Just think, you could give her a photographic memory, encyclopedic knowledge and the ability to do complex caluculations instantly! What a start.
I think most definitly it is pertinent to adults. We know how to activate our "right" brain -- its called alpha state. I think if as adults we did similar practices as the children while we are in a deep alpha state it'd be just the same. That site also really piqued my interest and faith in image streaming. Really bring that right brain back to life 
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