As of my knowledge cut off in September 2021, there are no specific age exemptions for the International English Language Testing System (IELTS) exam. The IELTS is generally open to individuals of all ages who wish to demonstrate their English language proficiency for various purposes such as study, work, or immigration.
However, it's worth noting that some institutions or organizations may have their own age requirements or preferences for accepting IELTS scores. For example, certain academic institutions may have age restrictions for admission purposes. It is advisable to check with the specific institution or organization you are applying to in order to confirm if there are any age-related requirements or exemptions for the IELTS exam in their particular context.