(Booster Shots, Los Angeles Times) Is 80 the new 50? It is when you compare Americans' average life expectancy today -- about 78 -- with what it was a century ago, when the average American lived to about 50.

In "The Longevity Prescription," Pulitzer Prize-winning author Robert Butler writes that this three-decade dividend, as he calls it, doesn't have to be lived out in declining health as many assume.

Common ailments such as heart disease, arthritis and lung problems are arriving a full decade later than they did 100 years ago. This suggests that we have it within our power to increase the chances of staying healthy longer, says Butler, founding president of the International Longevity Center and founder of the National Institute of Health's National Institute on Aging.

Genes play only a small part in longevity, he says -- studies consistently find a link of 5% to 35% between parent and child. He says research clearly shows that a healthy lifestyle can make a big difference in helping people live longer and push back or avoid the onset of chronic illness, lack of mobility and cognitive decline.

Of course, this won't be news to many. There has been a steady flow of research and stories for years suggesting that good health habits can make a difference. What Butler has done in his beautifully written new book is integrate these findings with inspiring stories, clear explanations, compassionate advice and step-by-step strategies to offer an easy-to-follow prescription for a more healthy life.

Yes, most people know they should be getting regular sleep, reducing stress, eating better, exercising more, getting preventive care and nurturing their relationships -- all topics in the book. It's putting these things into practice that can be the hard part. This is where "The Longevity Prescription" is particularly useful.

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