Actually...to comply legally..it's much more than just a simple "yes or no" for personalized ads or not. You're also supposed to show the end user who will be getting access to the data you collect if you show personalized ads. ie: Everyone advertising in your game.
"One option is to use the Consent SDK to present a Google-rendered consent form to your users. The consent form displays a list of the ad technology providers you've selected in the AdMob UI. The Consent SDK stores the user consent response."
"The other option is to use the Consent SDK to dynamically retrieve the full list of ad technology providers from AdMob, as explained in publisher-managed consent collection. However, in this case you'll need to determine how the list of providers should be made available to your users and present your own consent form to your users."