Would I choose a long life? Only if it’s healthy. Would I choose a very long life?

I’m 62 years old, and I am relatively healthy. Not as healthy as I could be; my kidneys are slightly off from some medicine I used to take, and I have a slightly larger heart than I should. I have bipolar disorder. A few medicines keep me in good shape.
I could see myself opting for a longer life. I don’t feel like I’ve lived long enough at this age. I have things I want to do, like retire and write. A few more years would be nice. Thirty or forty? Excellent. A hundred? Let me think about that.
Would I still have a purpose in my second century? I don’t know that I could live without a purpose. And that would depend on how healthy I am. If I spent my advanced years sick and decrepit, I don’t think that I would like to live that long.
The answer to whether I would like a very long life is ‘that depends on how healthy I am, and whether I had a purpose.’