Since no one really knows what’s going to happen to fertility, life expectancy, and particularly health core costs 50 years from now, all these calculations come with extremely wide error bars, making them essentially meaningless. For all we know, scientists might find an effective cure for cancer in a few decades now, single-handedly raising the life expectancy to 95 and “liabilities” to $1 quadrillion. Conversely, maybe we’ll all be treated by cheap robot doctors and our fertility rate will get back to 3 kids/woman thanks to all the Latino immigrants, and, in that case, there may be no liability at all.
