Fair Housing Question - Age?

[Sylvia B.]

According to Nolo.com, "The federal Fair Housing Acts do not expressly ban discrimination based on age. Nevertheless, it is definitely forbidden under the broader prohibition against discrimination on the basis of familial status."

I am shopping for a vacation rental for next year, and in the area I want to rent almost all of the VRBO ads state that the primary renter must be at least 25. Some of them add, "or at least 21 and married". I'm pushing 60, so it doesn't hurt me any. I understand the reasoning - this is a beach community and they don't want to rent to groups of college kids. But, no matter how reasonable the restriction is, aren't they flirting with Fair Housing lawsuits?