Those numbers make it sound like people you know today are living 40+ years longer than people you might have met in 1900. But that is not accurate unless you think of people you might have met as including new born babies. Babies born today are much likelier to live than babies born in 1900. But once you get through childhood you can expect maybe twelve or thirteen more years. And if you reach that magical age of 60 like many of us here you can expect to live 6 or 7 more years than your 1900 peer. Here is a link to a chart
that shows life expectancy by age over the years.