They should be able to stay alive
I think they could have shared the machine even though it's dumb to have only one healing machine in the sick bay. Since they have like 80 years left, Jennifer could have spent 40 years in the machine and Chris takes 40. That way, they only age 40 of the 80 years. They don't have to do all at once. They could do it like a few days a week to just stop aging
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