Hi, I moved your post to the English forums since it's the appropriate language.
I suppose you're talking about the mobile game PvZ Heroes. Unfortunately, I don't think there is any way to change the age without reinstalling the app, and in your case would mean to lose the progress. Setting the account age as underage sets some limitations to your account. For more information on these please read here> https://help.ea.com/en/help/mobile/ea-and-age-restrictions-for-mobile-games/
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Non fornisco assistenza tramite messaggi diretti. Per assistenza personalizzata rivolgersi a help.ea.com