I'm in the "there's probably something there" camp.

But before we attack longevity, we need to delay the onset of chronic disease. Then, we can look at staying healthy longer (AKA 'health span'), and maybe after that, treat aging as a disease, which in the very far future might be reversable.

Rather than write a long treatise here, I'd suggest that anyone who's interested, and has access to a podcast player, check out Peter Attia's podcast - he covers, via interviews with leading researchers, what's going on in the field of longevity, which, indeed, starts with delaying chronic disease.

There are a number of things we can all do now (which don't involve any elixirs). He's science driven. One of my fave podcasts has to do with learning how to read and understand research studies, how to know if findings there might be generalizable to the population as a whole. I have a stat background (not bio) and still learned a good bit.

Disclaimer: I'm a paid subscriber (mostly as it gives me access to very detailed show notes, including clinical study links, when they're referenced). But the free ones are a great place to start, as is David Sinclair's' book.