If your form signs people up for something age-sensitive, you need to know a visitor’s age before they fill it in, not after the entry lands in your inbox.
The quickest way to age-restrict WordPress forms is with the WPForms Form Locker addon. You switch on age verification in the form’s settings, set a minimum age, and the form stays hidden behind a birthdate check until the visitor passes it.
Whether it’s for legal compliance or your own business policy, setting up that check early means only eligible people can submit your forms.
In this post, I’ll walk you through the whole setup step by step, plus a second method for the times you’d rather collect a date of birth inside the form.