It's clear that the simple fact of growing older - chronological aging - is relentless and unstoppable. But experts studying the science of aging say it's time for a fresh look at the biological process - one which recognizes it as a condition that can be manipulated, treated and delayed. Taking this new approach would turn the search for drugs to fight age-related diseases on its head, they say, and could speed the path to market of drugs that treat multiple illnesses like diabetes, heart disease and Alzheimer's at the same time. “If aging is seen as a disease, it changes how we respond to it. For example, it becomes the duty of doctors to treat it,” said David Gems, a biogerontologist who spoke at a conference on aging in London last week called “Turning Back the Clock.” At the moment, drug companies and scientists keen to develop their research on aging into tangible results are hampered by regulators in the United States and Europe who will license medicines only for specific diseases, not for something as general as aging. “Because aging is not viewed as a disease, the whole process of bringing drugs to market can't be applied to drugs that treat aging. This creates a disincentive to pharmaceutical companies to develop drugs to treat it,” said Gems. The ability of humans to live longer and longer lives is being demonstrated in abundance across the world. But with greater age comes a heavier burden of age-related disease. Cases of dementia and Alzheimer's, incurable brain-wasting conditions, are expected to almost double every 20 years to around 66 million in 2030 and over 115 million in 2050. Diabetes, heart disease and cancer, and the cost of coping with them in aging populations, are also set to rise dramatically in coming decades in rich and poor countries alike. Nir Barzilai of the Albert Einstein College of Medicine at Yeshiva University in New York, says one way of trying to face down this enormous burden of disease is to look at the biggest risk factor common to all of them - aging. “There's one thing everybody is missing,” he said. “Aging is common for all of these diseases - and yet we're not investigating the common mechanism for all of them. We are just looking at the specific diseases.” To try to reverse that, Barzilai and many other scientists around the world are studying the genes of the very old and starting to find the genetic mechanisms, or pathways, that help them beat off the dementias, cancers, heart diseases and other age-related illnesses that bring down others who die younger. By finding the genes thought to help determine longevity, scientists think they may be able to mimic their action to not only extend life span, but, crucially, extend health span. For biogerontologists, as scientists who study the biology of aging are known, the struggle is to convince people that their goal in unpicking the science behind aging is no longer life, but healthier life.
