I want to live forever. That doesn't mean I want to remain static and unchanging or to stagnate. I want death through change, not because my mind collapses due to biological causes. If I ever stagnate, that's a form of death, and I bet sooner or later I'll choose to check out, or become irrelevant enough for society and my peers to check me out, directly or indirectly, through social exclusion.
I strongly resent those who try to tell me what's best for me or predict what will happen if I live a long time. If you think death within 40-90 years is best for you, choose that path, stop trying to validate your life philosophy by imposing it on others and leave the rest of us alone to develop technology and strive for something more than what we are today.