You suddenly cannot recall your phone number. You find the phone in the fridge. Your new sandals are sitting in your kids' shoe tree. You're starting to Google the key phrases "early dementia" and "early Alzheimer's."

It's a frightening concept, losing your marbles. Many Boomers have faithfully been married to physical fitness for years, but as they gray around the temples they're starting to worry their noggin' may someday ask for a divorce. According to a recent study of older Boomers (born 1946-1955), a growing number believe in the plasticity of the brain -- calisthenics for the mind, if you will.

Beyond $1,000 genetic tests to examine risk factors such as Alzheimer's by 23andMe and deCODE genetics, there are also brain health products such as Posit Science's $395 computer cognitive exercises, MindFit's $149 assessment/personalized cognitive training software and Nintendo's $19.99 Brain Age 2 video game offering math/memory exercises. As I reported earlier, brain fitness is a young industry poised for big growth.

I can see it now, Boomers Aerobics where the instructor shouts cognitive training directives from the podium. How about a Cardio/Cranium Theatre challenging your memory from the big screen? Don't forget the monthly brain massage.