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But it only takes 30 years to make a 30 year old. They're at least 3x more replaceable than 90 year olds.

[edit] also, do things for whom? To what end if not to build experience?

Alternatively, most 30 year olds have 30 more years to contribute to society. Most 90 year olds do not.

Why is “ability to contribute to society” a factor in considering who to save? Down that path lies euthanasia of the disabled and mentally ill.

and this is bad how?