So, whether they store the information or not, the information may not be encrypted while being processed (lots of IoT tech doesn’t encrypt data streams, and some of them don’t even have a firewall between them and the internet).
There’s no good reason for them to need Internet access to sweep or mop your house.



It’s likely that Apple already has age data on you because they collect all kinds of data including payment details from you. If you use any paid apple service (pay for apps on the app store, pay for music, or cloud services, use the air tags etc), it’s likely they already know your age.
The reason to be worried about this isn’t because now apple has this information, but because of the progression of this information being demanded, shared, and hoarded by less secure age verification services.
Anyone hoarding personal identifying information is a target for criminal enterprises that want that information.
Apple can be hacked, but you have to evaluate your threat model and what information you’ve already given them, as well as what information is already out there on the internet about you.