Hey,
at our Company we work together with many young people. For legal reasons they have to be over 18 to work with us. To perform a quick age check on our data (coming in from a Typeform application - but that is another story) we made a formula to perform a age check on a “Birthday-Column”. It works great (took some time to figure it out):
IF((DAYS((DATE((SUM(YEAR({Birthday}),18)),(MONTH({Birthday})),(DAY({Birthday})))),TODAY()))>0,“not 18”,“over 18”)
The screenshot is in German Geburtsdatum=Birthday and we used “ok” instead of “over 18”.