Adding field validation in custom Content Fragment Model's data types

Hello,

We have a requirement where we need to add custom field validation when creating a content fragment (CF) using a custom content fragment model (CFM).

Currently when I create a CFM, I only see some limited option like can mark field as required or specify max char limit etc. But what if i need to create a custom date field called "Age" where I can specify Regex or logic that selected date can not be in past date etc, something like that...

I know we can create custom data types which I can use in my CFM but I dont see option to add validations on field link Regex, compare values, compare date value with current time etc.

We are in AEM 6.5.5.