During the last two centuries,there have been many spectacular advances in medical science,the main consequence of which has been the dramatically reduced burden of infectious diseases.While in the 1800s many people died before reaching adulthood,nowadays most people survive.Hence average life expectancy in 1800s was around 30—40,which was barely higher than it had been in Greek and Roman times(Finch,2010),but nowadays life expectancy in most modernised economies is During the last two centuries, there have been many spectacular advances in medical science, the main consequence of which has been the dramatically reduced burden of infectious diseasess.While in the 1800s many people died before reaching adulthood, nowadays most people survive.Hence average life expectancy in 1800s was around 30-40, which was barely higher than it had been in Greek and Roman times (Finch, 2010), but nowadays life expectancy in most modernized economies is