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The minimum age for performing manual defibrillation is set to ensure that the procedure is appropriate for the patient's age and condition. In this context, performing manual defibrillation on infants or young children requires careful consideration due to their unique physiological characteristics. By establishing a minimum age of equal to or over 30 days, it ensures that the patient has reached a developmental stage where the procedure is feasible and the risks associated with it are managed.

The other options relate to clinical indications or patient conditions rather than age criteria. Having an altered level of awareness may signal a need for defibrillation, but does not address the age requirement. "Shock indicated" refers to the clinical decision to administer a shock based on the patient's cardiac rhythm, while "no obvious ROSC" (Return of Spontaneous Circulation) indicates a need for further resuscitative efforts but again does not pertain to age. Thus, the choice that specifies a minimum age is the most relevant to the question regarding when manual defibrillation can be performed safely.