What was the average life span during the 18th century?

The average life span during the 18th century is best represented by the range of 40 to 50 years of age. This estimate reflects various factors, including limited medical knowledge, high infant mortality rates, and the prevalence of diseases that are less manageable by modern standards. While some individuals did live beyond this average, many did not reach old age due to the harsher living conditions and limited healthcare of that time. The other options represent averages from other historical periods or reflect modern life expectancy increases due to advances in medicine, nutrition, and overall living conditions. Thus, selecting the 40 to 50 years range gives a more accurate portrayal of life expectancy during the 18th century.