Most of them just talk to talk. Most kids don't even have the money to be buying peptides, needles, and everything else that goes into doing that (alcohol prep pads, needle disposal bins, etc). They just ask questions about it because they're wanting to, but rarely do.
The ones who put in the effort into doing it though are normally the ones who were going to be doing something regardless of what it is.
Though I agree that it's kind of goofy to be super young and tryna spend all of this money on skincare. However, in a community where there's hundreds upon hundreds of threads about skincare, there's not any threads explaining why they might want to hold off until they start having skin concerns.
If I spent every day in a shoe store for months, I might be interested in buying shoes.