The SS trust fund is projected to be depleted by 2033, at which point benefits will be automatically reduced to just 79% of their current level, by laws that are already on the books. This information is freely available from the Social Security Administration themselves. [1]
Keep in mind, Social Security's and Medicare's unfunded future liabilities grossly exceed the current liabilities of these programs.
These defined benefit programs are mathematically reliant on a growing, rather than shrinking population, yet a shrinking population is what the entire industrialized world is currently on track for with our sub-2.1 TFRs.