I don’t. I think it’s the immediacy of death that makes life interesting.
I can make a reasonable guess as to what I would be doing in the next few years of my life. I can make a plan for, say, next 20 years, and hope that everything would go well. Beyond that, I have no idea what I would be doing or where I’d be. Given that, it’s almost impossible to think where life would take me if I were to live to a hundred. I would be happy with 75.
I can’t imagine what life would be like with a failing body and mind. Even if by some miracle if we’re able to slow the ageing process, or upload our brains to a computer to live forever, I think things would be quite boring after you’ve lived as long as 100. I would need some rest then.