Born with working hearts? These should indicate life (7)

I believe the answer is:

breaths

'these should indicate life' is the definition.
(breathing is a sign of life)

'born with working hearts?' is the wordplay.
'born' becomes 'b' (abbreviation next to the year of someone's birth).
'with' is a charade indicator (letters next to each other).
'working' indicates an anagram.
'hearts' anagrammed gives 'reaths'.
'b'+'reaths'='BREATHS'

(Another definition for breaths that I've seen is " Inhalations and exhalations".)

I've seen this clue in The Telegraph.

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