That is the reason for the Shoah Project, which has collected nearly 52,000 video testimonies from survivors and witnesses.
As an aside to this, not directly related to the OP but tangentially of intereest, Werner Klemperer, who played the bumbling Nazi martinet Col. Klink, was a refugee, his father (conductor Otto Klemperer) having moved tje family to Los Angeles in 1935 to avoid persecution as Jews. He agreed to the Klink role only on condition that Klink be portrayed as an incompetent. Klemperer died in 2000.
It would be pretty surprising if there were more each year:D
To summarize, there are thousands of survivors of the concentration camps still alive. Given that it’s only been 64 years since the end of World War II and that there were children in the camps, we can expect that it will be at least another twenty years before they all die. Incidentally, I don’t think that there’s any evidence that someone who survives the concentration camps is less likely to live to old age than anyone else of the same age. This may seem odd, but there are actually statistics showing that people who lived through periods of very tight food rationing in World War II are living longer than people of the same age who didn’t suffer any significant food rationing.
There was a mouse experiment recently that ones kept a bit hungry lived longer, though you don’t want to outright starve them. I get the feeling that (for times past of not much medicine too) those that survived at all can pretty much survive anything for the rest of their days. What is perhaps more surprising is how many seem to have come through without serious psychological damage. But then not all camps were the same and some of the worst cases were only like that for a relatively short period because they were left isolated often under new commanders with no idea what to do and nothing to do it with. Not that that excuses anybody even if there were no international conventions that applied strictly in those circumstances. Anybody except SS would have opened them.