I'm going to disagree.
As you move back in time, by the centuries, you'd notice that life expectancy just drops. There was a time when there average life expectancy was hovering at a mere 34 but things like auto-fumes and fast food were inexistent.

Penicillin and the many more life-saving medicines that we have today have pushed the average life expectancy of entire countries to 80+. The only thing keeping the entire world from reaching this is the flaws in the delivery systems of the medication. Projects like FarmaTrust are on the way to make sure proper access to proper medication is a reality everywhere.