Is there a way to apply a valid/invalid state to a group of form fields?

[PierBover]

I'm working on an age validation form with day, month, and year fields.

Each field has its own validation, and once they are all valid the group validation kicks in to determine if the data is above or below 18 years of age.

I was wondering if there was a way to have a container for all those fields, that would allow adding a valid/invalid class to the container and that would cascade to all the grouped fields?