What is the minimum age required to use #open? August 21, 2019 15:32 Updated Follow #open requires that you are 18 years old or older and that you provide us with an accurate date of birth when signing up. Our service is only for adults. You can read more in our Terms of Service. Related articles Can someone tell if I block their profile? What are #open’s Community Guidelines? How do I message people? How do hashtag lists work?