I checked before posting by typing in "median us income": https://archive.is/M05IS . It's $51,939. The difference is that this is median household income, not median personal income. This is the answer I usually see when median income is discussed, and it's really debatable which is the most appropriate to use when discussing what a person can "live off of", though I accept that personal median income is the most direct analog to personal Social Security payments. The real question is whether the OP has a wife that will also be collecting SS.
That's also a good point as to why people aren't saving money....