Longevity labs, "immortality islands" and grapeseed pills are part of China's national project to conquer aging, despite sometimes shaky science and extravagant claims. When a Chinese state television microphone recently caught China supremo Xi Jinping and Russia President Vladimir Putin musing about the possibility of living to 150 and perhaps even forever, many eyebrows were raised. But there has been no tut-tutting in the laboratory of Lonvi Biosciences, a longevity medicine start-up in the southern Chinese city of Shenzhen. "Living to 150 is definitely realistic," said Lyu Qinghua, whose company has developed anti-aging pills based on a compound found in grapeseed extract. "In a few years, this will be the reality." He is skeptical about modern medicine defeating death entirely, something Mr. Putin said was possible with organ transplants, but he thinks that longevity science is advancing so fast even the seemingly impossible might come to pass.