According to a BBC article (http://news.bbc.co.uk/1/hi/health/241864.stm) life expectancy in the late Medieval period in England was 30, and if one survived to 21 one would likely live another 43 years to the age of 64. In contrast, the life expectancy of the average Roman was 27 (https://www.britannica.com/science/age-distribution), with total life expectancy at 15 being 37–41 years. I was under the impression that quality of life was superior in Classical Rome due to improved sanitation and infrastructure, especially relating to the supply of clean water (i.e. aqueducts). If this is the case then how come the average Roman of antiquity died younger than the Medieval Englishman?
Are you able to find out whether that figure for Rome was for the city of Rome or for Italy, or for the whole of the Roman Empire?
Rome itself was a busy and crowded city, Mediaeval England was primarily agrarian.
Although one might expect that the life expectancy of a privileged Roman was quite high, many Romans were not living in a privileged way, and many inhabitants of Rome were slaves.