Longevity Escape Vulnerability

There's a lot of people now talking about longevity escape velocity, like Ray Kurzweil and others who are futurists. The idea is that we're going to keep outliving death by these technologies that will help us extend life. So I have so realistically, like, how long do you think we'll live? What's the possible limit of human longevity? "I'm going for at least 120, maybe 150, maybe 180"