Don't confuse medicine with modern medicine.
Medicine has been around for thousands of years and is the by-product of many trial and error events over these years. Medicine has morphed into many effective tangents such as herbal medicine, acupuncture and homepathy just to name a few. The father of modern medicine - John Rockerfeller lived well into his 90s and was into homepathy in a big way for his own personal health - but into modern medicine in a big way for his own personalk wealth.
Many Euroepan royal families are also supporters of homeopathy and if you want to see what makes you healthy and live longer - look up how they live in the Blue Zones - you will find there is little modern medicine but lots of healthy food and lifestyle.
By ''live longer'' - I dont' mean kept alive longer - I mean living a full life without going near a nursing home