To find out the age requirement for an Ariana Grande concert:
1. Check the official ticket vendor: Sites like Ticketmaster, Live Nation, or the venue's website often list age restrictions for specific events.
2. Look at the venue's website: Many venues have their own policies on age requirements, so check the website for the specific location of the concert.
3. Contact the venue directly: If you can't find the information online, reach out to the venue by phone or email to ask about age restrictions.
Remember, age restrictions can vary depending on the concert venue, location, and specific show policies.