Thank you for your input. Zerocarbisbest, I can't watch videos, but I think you and I both suspect that it's very difficult to prove longevity until we snuff it, and probably not even then because we never can tell how old we might have become if we had made different decisions..
Zand, that was useful input. A negative for continuing Metformin there apart from the weight loss angle, which is important to a lot of us.
Briandoc, we can compare notes in due course - it will be interesting.
I really appreciate all of you who have added to the information.