Banking regulations in the US and other regions/countries regulate the use of e-wallets by minors. Credit cards allow minors to enter into legal contracts which presents issues. Banks have restrictions as well as to the use of their cards. A few banks in the US are now offering specific financial products for use by minors. You will want to check with the bank to find out their restrictions on minors.
Apple specifically offers a managed program for older youths staring at 13. You can learn more about Apple Family Sharing in the support articles I linked to below.
What is Family Sharing? - Apple Support
Set up Family Sharing - Apple Support
Set up and use Apple Cash Family - Apple Support
Set up Apple Card Family and add a co-owner and participants - Apple Support