According to the Standards set by the Institute of Internal Auditors (IIA), an internal audit activity may report conformance with the Standards even if it has not been in existence for more than five years provided that it has conducted periodic self-assessments and meets the other necessary criteria of the IIA standards. External assessments are required at least once every five years, but conformance can still be reported if internal assessments are conducted in the interim.References: The Institute of Internal Auditors (IIA) - International Standards for the Professional Practice of Internal Auditing.