Parental Controls
Can I add parental controls for children over 13 in the United States?
iPhone 8
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Use Restrictions on your iPhone, iPad, and iPod touch - https://support.apple.com/HT201304 - "You can use Restrictions, also known as parental controls, to block or limit specific apps and features on your iPhone, iPad, or iPod touch, including access to explicit content in the iTunes Store."
If instead you mean Ask To Buy read this link please ⬇︎
Approve what kids buy with Ask to Buy - https://support.apple.com/HT201089 - Family Organizer receives requests by default, but another parent or guardian can be assigned permission.
Ask To Buy can only be turned on for members up to 17.