MetLife study pegs older at 40. Down it goes. No, that’s not the value of the dollar. It’s the line at which 'mature' markets and older adults are segmented and studied in this doom-and-gloom study. The latest from MetLife -- On the Critical List – mulls the impact of obesity and the rise of chronic disease among the 40+ population, but on page 9, it’s coughing up a technology to promote independence – you guessed it, the Personal Emergency Response System (PERS). Sure. Meanwhile, on the other end of the demographic dial, we find an impressive rise in a population living to 90 and beyond. Now the fastest growing group in the older population, some suggest that a change in the definition of the oldest be moved from 85 to 90. And life expectancy continues to rise among those who might have the money to buy goods and services, creating a viable target markets for sellers of goods and services. >>> Read more . . .