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Determine the formation channel of the active sources there (accretion-induced collapse of white dwarfs, white-dwarf or neutron-star mergers, accreting compact binaries) and its rate per unit stellar mass. Answer: a channel whose rate matches the observed fraction of FRBs in old hosts.","problem_ref":"2f15845d6566c93410008a8f7c998e19432acc2b552908ed9e77c8147a8763af","references":"","settled_by":"Precise localizations of a statistical sample of FRBs in old environments, with the rate per stellar mass compared to channel predictions.","status_note":"2025: the repeating source FRB 20240209A was localized to the outskirts of a quiescent elliptical galaxy.","title":"How do FRB sources arise in old stellar 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