Life expectancy is going up due to a variety of factors: better trauma care, better vaccination regimes, better sanitation, better nutrition, some better treatments (some amazingly so).
Nevertheless, a large fraction of medical screens and procedures does not improve average life expectancy when people actually try to measure their impact. Intensive end-of-life care does not improve life expectancy when similarly measured.
not just life expectancy in toto which you would rightly expect to have a huge number of variables that interact in unknown ways. many medical procedures have proven to be directly detrimental to health in double blind studies yet remain standard procedure.