A classic story by Ray Bradbury. Travelling astronauts find a well known doctor, and are welcomed to the feast the old gent has prepared for them. Doc Hathaway, and his family are all younger and more well preserved than expected on their far flung planet where they now reside. They all seem to be 20 years younger than they should be. Is there something strange going on, or is it just the affects of the doctors experiments with radiation?
Whatever is going on is unnatural, and there’s some explaining to do when grave markers are found that are 20 years old. With the results of human engineering on their hands, what will the astronauts do about it? Rescue them and take them home? Kill them to put them out of their misery? Who says they are even miserable?