Event registration field for Age
We offer many programs for a variety of age ranges and have a field for parents to enter their child's age. 
We would like to make sure a 5 year old doesn't register for a program for 10 year olds. 
So this field would have a minimum/maximum criteria and if not within that range, an error message would pop up with a box "This event is for ages MIN to MAX"
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Nicasio Design - Felix Figuereo commented
May be able to set up a custom process to allow fields to show only when a criteria is met. IE - show 5 year fields when 5 is entered in preceding field.