If I recall correctly, it’s 13+, but can be under 13 with parental permission.
Because I found someone on Replit and they state they are 10 years old, but I don’t know the exact policies. I was going to ask them if they have parental permission but I’m not 100% that’s the policy
Unless you are a Teams for Education student user, you must be at least 13 years old to use the Service. However, children of all ages may use the Service if enabled by a parent or legal guardian. If you are under 18, you represent that you have your parent or guardian’s permission to use the Service. Please have them read these Terms with you.
If you are a parent or legal guardian of a user under the age of 18, by allowing your child to use the Service, you are subject to the terms of this Agreement and responsible for your child’s activity on the Service.