Remaining life expectancy at age 18 was even lower in 1800 or 1700, from what I can tell. You can find small exceptions (like aristocrats in particular countries) but I'm not aware of any large (50,000 people or more) preindustrial population where the average teenager could expect to die older than age 60. I would be delighted to see counterexamples.
EDIT: This was interesting.
"Lifespans of the European Elite, 800–1800". It examines the lifespans of European aristocrats over the thousand years prior to the Industrial Revolution. It limits its analysis to people who reached at least 20 years of age. Per Figure 8, the average lifespan remained below 60 in the entire time period.
EDIT: This was interesting.
"Lifespans of the European Elite, 800–1800". It examines the lifespans of European aristocrats over the thousand years prior to the Industrial Revolution. It limits its analysis to people who reached at least 20 years of age. Per Figure 8, the average lifespan remained below 60 in the entire time period.
https://www.cambridge.org/core/journals/journal-of-economic-...