“Medieval people rarely lived past 30”

It is a widespread belief that people living in medieval times rarely saw their fortieth birthday, often dying in their early thirties. This misconception stems from a misunderstanding of historical "life expectancy" statistics. While it is true that the average life expectancy at birth in medieval Europe hovered between 30 and 40 years, this figure is heavily skewed by a tragic factor: extremely high infant and child mortality rates.

Historical and bioarchaeological evidence reveals that if an individual survived the perilous years of childhood, their prospects for a longer life dramatically improved. Many adults who made it past their early vulnerable years regularly lived into their 50s, 60s, and even 70s. For instance, if a person reached age 20 in medieval England, they could expect to live for another 20 to 30 years, often reaching their late 40s or early 50s. Some even lived to be much older, with historical records mentioning individuals in their 80s and 90s. This shows that older individuals were not an anomaly, but a recognized part of medieval society.

The reason this myth persists is largely due to how averages are perceived. When calculating an average life expectancy, the numerous deaths of infants and young children—often due to disease, lack of sanitation, and dangerous childbirth—drastically pull down the overall average. This statistical phenomenon creates the false impression that most people died young, rather than illustrating the reality that a significant portion of the population simply didn't survive early childhood. Without understanding the profound impact of infant mortality on these statistics, it's easy to mistakenly conclude that a short lifespan was the universal experience for everyone in the Middle Ages.