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Let me please inform you that we can use conditional logic on the form to do some smart things.
It is possible to set conditional actions based on current date +/- number of days.
Here is a quick example, form is showing/hiding a '18 Age Limit message' and a 'Submit button' based on provided date:
I have added two Show conditions for this.
today -6570 represents 'current date' - '6570 days' (which is equivalent to ~18 years).
Today +/- rules work for both the DateTime and the Birth Date fields.
If you are referring to something else, please let us know. We will be happy to help.