Sadly, not many of them left now.
Less than half, sadly. Of the 29 Apollo astronauts who flew in space only 14 remain now. From those 14, 11 of them flew to the Moon (out of 24), and only four of
them walked on its surface (out of 12 who landed in total). The entire crews of Apollo 12 and 14 are no longer with us. Out of the 11 crewed Apollo flights, only the crews of Apollo 8 and 9 are still with us in their entirety.
It would be nice to think that at least some of those who went to the Moon in Apollo will be around when the next crew lands there, or even orbits, but it is looking less and less likely.