As much as I would like to live into my 90's and even top my 100's, my concern is just how productive I would be in those years. I do not want to sit around for ten or fifteen years dependent on people to take care of my every need. I do not want to depend on the government to cover all my expenses.
My goal of living long would only be complete if I was healthy, mobile, and financially secure. That means I would not be living in pain, able to get around on my own, and having a reliable and steady source of income. It is a lot to ask but I think I could do it. Even more importantly though, I would want to have meaningful work to do. Something eternal. Something that mattered that would build my legacy.
The trick with living a long time is continuing the independence that has been already achieved.