Recently, I showed my friend what Life Tables and Mortality Tables are (e.g. https://en.wikipedia.org/wiki/Life_table) - I tried to explain possible uses for these kinds of tables but my friend argued and didn't think they were that important. I tried to explain to explain that they are useful in the Actuarial world for studying the rate at which people die and can in turn be used to set the prices for insurance premiums ... but my friend just replied : "So what, old people die - how does making a graph that shows the life expectancy really help anyone with anything useful beyond a infographic?".
I tried to think about how to explain the importance and applications of Life Tables and Mortality Tables - the only thing that came to mind is that these are closely related to the Kaplan-Meier Estimates (e.g. there is something called the "Life Table Estimate"), and thus Life Tables and Mortality Tables can be used to compare Survival Probabilities and Hazard Rates between different groups of people.
But other than that - I am unfortunately unable to come up with a good and convincing answer to the question "So what, old people die?".
Can someone please help me come up with an explanation as to why Life Tables and Mortality Tables are useful and what kind of applications they have?