Trying to use ID to prove age

You do not say where you are (this is a worldwide forum) so that makes it hard to be specific. Choose from these support articles to see the details of accepted age proof:

Here are support articles covering age verification requirements that are being implemented in several countries:

If you're asked to confirm that you’re an adult - Apple Support

Region-specific rules for managing an Apple Account - Apple Support

Age requirements for Apple Accounts in the UK —> Age requirements for managing an Apple Account in the UK - Apple Support

Accepted ID forms are: “passport, driver's license, or one of the following PASS-accredited Proof of Age cards: CitizenCard, My ID Card, TOTUM ID card, or Young Scot National Entitlement Card. Debit cards and gift cards aren't supported.” “If you already have an Apple Account, Apple will check if you have a credit card on file or other eligible methods [such as possibly the age of the Apple Account] available to confirm that you're 18 or older.”

More about the UK —> Age verification is stuck for 3 days in A… - Apple Community

Community threads outlining age verification in the UK and ID recognition troubleshooting tips:

iPhone not accepting ID for age verificat… - Apple Community

Can't confirm age in UK - Apple Community

This thread specifically discusses UK permitted IDs and an additional method based on age of the Apple Account. —> How can I verify my age without a credit … - Apple Community

Age requirements for managing an Apple Account in South Korea —> Verify your age when you download or stream mature content in South Korea - Apple Support

Age requirements for managing an Apple Account in Singapore —> Age requirements for managing an Apple Account in Singapore - Apple Support