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A new book says it’s all about longevity, but its authors aren’t alone in their optimism about it.

Read moreHow to Live a Long Life by John B. Hill is a collection of essays by authors who talk about the science of living long.

The authors include former President Bill Clinton, former Vice President Joe Biden, former Secretary of State Hillary Clinton, and others.

Hill is the author of How to Live Your Life: A New Guide to Happiness, and the co-author of a number of books on life.

Hill, who is a professor of economics at the University of Delaware, is also a prolific writer.

He told Business Insider that the book is based on his own research, and that he and his co-authors “do not try to present a single theory or set of rules.”

“We want to be able to put the facts together to explain why people live longer,” he said.

In an interview with Business Insider, Hill said the book was based on a “bible of longevity” written by the late Pope John Paul II, who called for people to have a longer life expectancy.

Hill said that his team at Harvard University included two Harvard professors, who are all former members of the Vatican’s top decision-making body, the Congregation for the Doctrine of the Faith, the religious organization that manages the Church’s official position on life and death.

“The idea is that you need to know your life and know the facts and you can take it from there,” Hill said.

“If you’re not a member of that body, then you can’t really say what you know about longevity.”

He added that the authors wanted to “show that it’s not all about the genes.”

Hill’s book is titled “The Science of Life: The Science of Living Longer,” and it has been published by Simon & Schuster since March.

The book is currently on sale in its Kindle version, and in print and ebook formats.

In addition to Hill, the authors include Daniel Engber, a Harvard professor and a senior fellow at the Hoover Institution, and Michael Moss, an economist and former director of the Center for the Study of the American Economy at Harvard.

In his book, Hill wrote that the number of years a person has lived is “the best measure of how long one can expect to live.”

He also said that if we want to have “the most long life possible, we must have more of a longer-lived population than our current population.”