Speaking more generally, the ethical theory should be based on some kind of axioms. If we take an axiom that “human life is most important value”, we easily come to the conclusion that death and aging are bad.
If we take the utilitarian axiom “sufferings are bad”, we could come to the same conclusions again, but after more complex constructions, which includes attempts to correctly define sufferings.
Speaking more generally, the ethical theory should be based on some kind of axioms. If we take an axiom that “human life is most important value”, we easily come to the conclusion that death and aging are bad.
If we take the utilitarian axiom “sufferings are bad”, we could come to the same conclusions again, but after more complex constructions, which includes attempts to correctly define sufferings.