That’s based on mean age at time of death. Keep in mind it wasn’t unusual to loose 2 or 3 of five children to injury and disease before they reached maturity in that age.
It was rare? I just typed in some of the founding fathers and the ones I typed lived into their 70’s and even 80’s. I kept going and if about 20, I only found two that lived less than 65 years.
Hard to make it to 65 if you die of smallpox, measles, whooping cough, Indian raids, war, diphtheria, influenza, yellow fever, tuberculosis, cholera, polio, typhoid, starvation, exposure etc before you hit 15.
You don’t really understand how life expectancy rates are calculated do you?
Service in any formal militia is not a requirement of a preexisting right and it is established law, settled law, that our right to keep and bear arms is a preexisting right and The 2nd Amendment merely prohibits gov’t from infringing on that right.