I think that is a safe practice. There are a lot of consequences for allowing minors on online platforms. However, I use 13 years as minimum age because that's the standard practive on most online platforms.
But in most cases, you're responsible for anyone who is a minor on your website. If you allow children on it, you're responsible for them. That's why I recommend folks up the age limit to 18 just to be safe. It's not the same internet today as it was in 2010.