I recall watching a movie very similar to First Men in the Moon. But it's made after that film.
In the beginning it's the celebration of the first Moon landing at 1969. A little boy encounters an old man who tells him he and his friend were the first people who landed on the Moon, and all the news of Neil Armstrong being the First Man is a lie.
Then he tells his story. In a flashback he is convinced by a scientist and inventor to go on a journey to the Moon with him. On the Moon they encounter aliens and so on.
The movie ends with the old man finishing his story.
What was the name of the film? Was it also based on the novel the 1964 movie was based on?