You can't block purchases within this app, regardless of age. However, there is a Diamond purchase limit: 5,000. This limit does not reset with time.
The Apple iTunes Store and the Google Play Store allow you to set a password to prevent unauthorized purchases on your device. If you are concerned about unauthorized purchases, we recommend that you require a password for purchases.
For more information about restricting purchases on your device, please see the articles below that corresponds to your operating system.
Apple iOS
https://support.apple.com/en-us/HT204396
Note: this link takes you to a web page not created or maintained by the Pokémon Company International.
Android
https://support.google.com/googleplay/answer/1626831?hl=en
Note: this link takes you to a web page not created or maintained by the Pokémon Company International.
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