What works for Geary also seems to work for mice. A new study found mice who were slightly underfed lived longer. Experts on human aging say eating less is healthier but they don't know how it affects the aging process. Nutritionists, however, are skeptical. They say many elderly people don't get enough nutrients now, cutting back could cause other problems.
Researchers also say heredity, fitness and lifestyle all play a part as well.
The debate may go on for a long time but for now Geary is convinced it works. After all, a doctor once told him he'd only live to be 90. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.