Ok but if I understand correctly this shows average living expectancy only in matter of Britain, and only between XIII to XV centruy (talking about medieval times). And its based on assumption that this male aristocracy member survives his first 21 years (correct me if im wrong).
What about other parts of europe / asia / africa, earlier part of medieval times (IX, X, XI, XII century), and what about true average life expectancy, when u dont automatically assume that feudals will survive first 21 years of their life?