Not unless you actually meant 16<x<18 today and >18 tomorrow.
replyYou can be 30 and verify >16 today and >18 tomorrow, obviously without being 18.
which is nothing in comparison to leaking all of personal information
replyyou can also introduce some jitter like changing age range only once a week/month/year for everyone
Birthday, zip code and gender is enough to uniquely identify most Americans.
replyWell don't reveal your birthday then. Wait 5 days to confirm >18.
replyIf you run into a liquor store yelling "Im finally 18, here's proof." that's on you?
If you want privacy you need to fuzz the transition. Many platforms support that today. Or you can create a separate account when you graduate.
replyBut also, knowing someone's birthday without trying it to other information greatly reduces the risk of harm.