Old taste buds make for hot tongues

But some food scientists and market researchers think there is a more surprising reason for the broad nationwide shift toward bolder flavors: The baby boomers, that huge, youth-chasing, all-important demographic, are getting old. As they age, they are losing their ability to taste - and turning to spicier, higher-flavor foods to overcome their dulled senses.

Chiefly because of degenerating olfactory nerves, most aging people experience a diminished sense of taste, whether they realize it or not. But unlike previous generations, the nation's 80 million boomers have broad appetites, a full set of teeth, and the spending power to shape the entire food market.

What's known is that at a certain age - after about 40 for most people - the number of nerve receptors in the nose and tongue that respond to smell and taste dim and decrease. As that happens, complex flavors become duller. Sweet and sour tastes decline sharply; salty and acidic tastes remain brighter for longer.