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It’s actually not a terrible assumption. If someone was going to live to 1000 years old, they are probably already alive today.
It’s possibly more likely we will destroy ourselves in that time frame though… So 50-50, you’re either immortal or you aren’t.
Hydrogen gets shit on loads, but this is exactly the kind of thing it can do pretty well. When you have excess, you don’t need to have to worry about efficiency in the same way. Then it’s ready to go once needed.