Abstract
Introduction An age threshold approach to aspirin prophylaxis in people without known vascular disease has two important problems. The balance of benefits and risks of aspirin in people aged 70 or over has not been clearly defined in randomised trials, and the benefits do not clearly exceed the risks in younger people without vascular disease. Consequently, it would be unwise to adopt such a policy, whatever age threshold is chosen, until we are sure that older patients will derive net benefit from it.

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