Why is my ID repeatedly not accepted for age verification?

You haven't told us where you are located or what exact problems you are having. Refer to these support articles and also read the tips and suggestions in the links to related threads.

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

Region-specific rules for managing an Apple Account

https://support.apple.com/125662

https://support.apple.com/125666

Age requirements for Apple Accounts in the UK —> https://support.apple.com/126788

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 —> https://discussions.apple.com/thread/256294620?answerId=261943146022#261943146022

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

https://discussions.apple.com/thread/256270869?sortBy=oldest_first

https://discussions.apple.com/thread/256269077?sortBy=oldest_first

This thread specifically discusses UK permitted IDs and an additional method based on age of the Apple Account. —> https://discussions.apple.com/thread/256295154

Advice for taking a photograph of a document —> https://discussions.apple.com/thread/256342390?answerId=262074526022#262074526022

Age requirements for managing an Apple Account in South Korea —> https://support.apple.com/HT209533

Age requirements for managing an Apple Account in Singapore —> https://support.apple.com/126786

Age requirements for managing an Apple Account in Australia —> https://support.apple.com/126781

For further assistance:

You can reach Apple Support here: https://getsupport.apple.com/

You can also find the support phone number for your region at this link: https://support.apple.com/HT201232

If you cannot verify your age this does not mean you cannot use your account, only that you will be restricted from using services and visiting web sites with adult content.

Governmental regulations in place in many countries need to be respected.

Apple provides guidance through online articles:

Eg: See: Region-specific rules for managing an Apple Account

and

See what to do: If you are asked to confirm you are an adult:

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Re: " ... every time I show my id it doesn’t go through?"

Wondering what you are using for ID,

and

whether it is what is needed for verifying your age in your country or region.

The linked articles above can help you check.

(Eg: See what forms of ID you can use where you live.

Also: there are tips for using a credit card, or tips for successful scanning.)