It does not make sense to me why people would want to live beyond 50 years old, especially since health problems start becoming more frequent around that age.
Which makes me ask: Why do people wish to live long beyond the age of 50?
If I bring any of my core beliefs into this discussion I'll be dismissed, so I won't. I'm operating in this discussion as though your premise is the sole correct one. That being the case 1000 years? Way too short I'd love to live infinitely. I'd want to feel things and participate in society as long as possible. "Mattering" to a small degree does carry some weight in my life. Its why I do the positive things I do and why I work the career I do. I recognize on a cosmic scale I don't matter, but why is that of any consequence at all. The individual experience you can have when you don't matter is all that really counts. So cutting it short/not wanting to extend it makes even less sense. I'm not trying to change your mind obviously and I'm enjoying the discussion.