Heart disease was infrequent prior to 1900---far less prevalent than now.
Maybe because the
average life span was around 50 yrs old.
Accounted for almost entirely by infant mortality.
^^^^^^^^
Infant mortality factored in changes things quite a lot.
Records from over 3 thousand years ago speak of 70+ average life spans.
It's doubtless fluctuated frequently all over the earth due to warfare, slavery, disease, religious practices, economic, climate, and agricultural changes.
