Great Humanity Delusions

Legends about such sources exist in different parts of the planet. They say that Columbus laid the foundation for their search. The Indians, with whom he had a chance to communicate, claimed that there are springs whose waters "make old people young again." But how true are these legends?
Those Spaniards made a lot of efforts to find such springs. They interrogated captive Indians with partiality, did not disdain torture, and spent a total of many years searching.
More than others, a certain Pons de Leon, a professional warrior and adventurer, was zealous and managed to get the title of ruler of the island of Hispaniola - modern Haiti - and Puerto Rico by the end of his life. In 1511, he personally took part in the interrogation of captured Indians, who told him about the miraculous source. According to them, one Indian, "stooped over by old age", drank water from an unobtrusive spring, after which he "regained male power and performed male duties, taking a new wife and giving birth to children."
However, the long-term search for Pons de Leon himself ended to no avail. Maybe the Indians tricked the too gullible Spaniard? Everything is possible in this world. But here is the story a journalist and writer Mikhail Rechkin told about this.
In 1998, a newspaper article came up to his arm containing a letter from a certain Helen Nikitin from the USA. She testified:
"A former compatriot and now a US citizen writes to you. I got here 20 years ago by accident. And all the love! I am not Jewish and not a political refugee. But she ran away, falling in love with madness, when, on a tourist ticket from BMMT, "Sputnik" traveled to Italy and met Jack. I studied in "injection", so there were no problems with the language. I will not tell you what we had to go through, but now we have been together for 20 years, and we have three children.
But the most interesting thing I want to tell you is that I practically do not get old. And it's just amazing! I am sending you a photograph taken in May 1998. On it I just turned 40 years old. But I look the same 20 years when I came to America. And here I just want to tell you a phenomenal story.
We got to America illegally through Mexico. I didn’t have a visa. As in some adventure novel, we without documents got here on a merchant ship sailing to Mexico. True, Jack was worth a tidy sum. So, for four months I had to hide in the caves on the border with the USA. Jack paid the inhabitants of a small Mexican village to feed me. And at that time he was solving the issue of documents.
At first I didn’t understand the local Spanish (the Mexican dialect is very different). But then I got used to it. So, Amila, the girl who brought me food, said that I was in the cave of "eternal youth". Anyone who stays here long will never grow old. This is what the girl was talking about. She admitted to me that she was 50 years old. I just laughed then. And now I think: probably it’s true. I also feel like a 20 year old girl. Everyone is surprised, and I begin to believe in a fairy tale. "
So, we have evidence. However, there are questions about this letter and its author. Suppose even that this is not another newspaper duck of the "yellow press". But why then have the inhabitants of this Mexican village still not turned the cave of "eternal youth" into a source of huge income? You must admit that in this world there would be many multibillionaires willing to pay any money for a miraculous drink.