If you’ve looked into the idea of trying to stave off aging, chances are you’ve encountered the work of Harvard geneticist David Sinclair. He has become one of the nation’s foremost “longevity influencers,” the Wall Street Journal reports. But its lengthy profile digs into how the 54-year-old’s scientific peers have begun distancing themselves from his work. The biggest controversy emerged on Feb. 29, when a company he co-founded called Animal Biosciences quoted him as saying they had “developed the first supplement proven to reverse aging in dogs.” If true, that would be a bombshell, but scie…