Despite all the recent hype from anti-aging evangelists and companies touting ways to extend life, human life expectancy is actually slowing down after accelerating in the previous century. In a paper published in Nature Aging, researchers led by S. Jay Olshansky, professor of public health at the University of Illinois in Chicago, report that factors that have contributed to remarkable extensions of life expectancy in the 20th century are reaching the point of diminishing returns.