system
Given the following post, respond as if you're commenting on Reddit:
human
I think Social Security should by definition be tied to the average age of death. CMV

Social Security in the United States is unsustainable. When it was created, life expectancy was much shorter and people did not generally live on it for very long. Now, people can be dependent on their Social Security paycheck for thirty years or more. With the average life expectancy going up so much, this model is mathematically guaranteed to fail in this generation at this rate.

Yeah, it will hurt, but it needs to gradually be pushed back to, say, the average lifespan minus five years (so roughly 72). Perhaps in the eight or so years between the current age and the new one there would be a dormant period where those still working would neither pay into the program nor receive from it.
gpt
This will have a disproportionately negative impact on the lower and middle classes, who tend to work much more physically demanding jobs that become much more difficult to perform with age.  They also tend to have shorter lifespans than those in the upper class, being that they have less access to preventative medical care.  I'd say these are the people we need to be helping *more*, but your proposal would have the opposite effect.