What makes you think your device has anything to do with it?
It'll be Netflix, your bank, the DMV, email clients, forums, reddit, TikTok, Facebook, Intuit products like TurboTax and Quickbooks, various GIS systems, mobile providers, app stores, games, rideshares, food delivery, amazon, twitch, X, they'll probably make some laws that Lemmy has to be blocked unless they do it, etc.
"We're sorry, your operating system does not support legally-required methods of age verification. Please upgrade to an Amazon Fire Tablet where everything runs from the cloud and its impossible to do anything except what we allow you. Please drink a verification can."