The problem with this approach is: You don't know if this lifestyle caused you reaching a certain age, there is no scientific basis whatsoever. Which turns it into a religion.
You can measure the group against the population in general to see if you have a significant change, if it only had an effect on people starting before age X, what the causes of death were (some could be omitted) etc, so I guess there is, we're just lacking data since it requires a lot more people doing this to get old first.
So what? As long as the vendors of longevity products get rich everything is dandy. Getting and being rich is the only religion taken seriously anyway. Being an adept of the longevity religion requires you to be a high-level acolyte in the Church of Being Rich to begin with.