sentences:  In humans, the 'late-life' stage of life is only reached at 90 years old, whereas the data for flies scaled to humans would predict a 'late-life' stage for humans at 40–50 years old.Rose suggests that human populations' adoption of agriculture led to more children surviving to adulthood, and to reproduction occurring later in life.Agriculture is also hypothesized by Rose to have resulted in high population density, thereby increasing the range of ages not under selection.