Eloquent Relationship Count Constraint

I am trying to write an eloquent query that would work as follows:

Tables:
Order
Support Ticket (one to many with the order)

Query: Filter the support tickets and only show the order if the support ticket is less than 45 days old.

I feel like this would be an adaptation of the whereHas() method in Laravel but I am not sure how to implement a filter or a date search on a relationship like this.

Thanks!

via Chebli Mohamed