The company says it is ready to give an experimental anti-aging therapy to older people at a clinic north of Bogota, Colombia. But that’s not all — it’s also charging people $1 million to participate.

I wonder whether the last sentence "It's also...participate" is grammatical. And I'm a bit confused what "to participate" grammatically modifies or refers to. Maybe is "to participate" modifying "people"? or $1million?

It seems to be more correct to see $1million as being modified by "to participate", considering the sentence below.

And what about the kids in the U.S. who don't have a dollar to buy a book?”

Here, it's clear that "to buy a book" modifies a dollar. If it doesn't, the meaning doesn't seem to make much sense.


I'm not qualified to answers such questions. Do not depend on my answer.

If I just tried to think with you, I would say that based on my understanding to the meaning,"to participate" is referring to the people who will participate in that experiment, because they are the the ones who will be participated into that experimental therapy. Money is a way to participate, but money itself will not participate into that experiment. In other words, money is not going to be given experimental anti-aging therapy.

fire1older people

Just writing old people would be enough.