This is intended behavior. For a bit of context, you need to both reach all ages on your account reach and game reach. If one of those aren’t met yet, then your game will be restricted to 16+.
Due to a safety update, games are restricted to 16+ until they meet both the account reach and game reach requirements, the requirements are:
ID Verified
2 step enabled
Good account standing
Refundable 1,000 robux fee
500 highly engaged players
Based on the screenshot, you need to submit a 1,000 robux fee and reach 500 highly engaged players (the bar at the bottom) in the past 60 days. A highly engaged player is a user who spent a specific amount of robux and/or other small requirements as well. This requirement can be skipped by paying a refundable 100,000 robux fee
Hi! Soundmoji is correct, you need to meet the requirements listed on the Audience Reach page to become eligible for players under 16. I’m going to close this report, but let us know if you run into any other issues.