This dates from 2012:
And is surprisingly accurate. Right now the survivorship is running towards the high end of the 95th percentile; The lunar walkers are lasting 3-4 years longer than expected. The 5 to 4 survivor transition was expected in ~2019. We “should” be down to about 2-1/2 by now. Although that’s base on actuarial tables for mere mortals, not folks who once passed an astronaut physical and have had lifetime medical care.
I don’t know anything about how well Aldrin, Scott, Duke or Schmitt are doing here in 2023. We might be about to catch up to the trendline. Sadly.