Western medicine is one of the primary drivers of global life expectancy increases only though vaccines, antibiotics, and trauma care. Other than that it has had very little effect: we could eliminate all other forms of medical care and average life expectancy would decrease only marginally. Public sanitation and food safety enforcement have had much larger effects.

Where western medicine has had larger effects is increasing quality of life. Now you can get a hip replacement to restore your mobility or take a pill to fix your erectile dysfunction.