Alexa needs a little work and bing is not helping.
Try it yourself: 3/5
“Alexa, which United States presidents are still alive?”
“The US presidents that I know are alive are Barack Obama, George W. Bush, and Bill Clinton.”
“Alexa, list the living U.S. Presidents.”
“Alive US Presidents include Donald Trump, Barack Obama, Jimmy Carter, Franklin D. Roosevelt, and Ronald Reagan.”