Which of the following phrases in a rental ad may be permissible?

This phrase implies a restriction based on the age of children, which can be considered discriminatory against families with younger children. Fair housing laws prohibit discrimination based on familial status, meaning that advertising for rentals should not specify age restrictions regarding children.

This phrase suggests a restriction based solely on age, excluding families with children. Such a blanket restriction can violate fair housing laws that protect against discrimination based on familial status. Consequently, this phrase would not be permissible in a rental advertisement.

This phrase discriminates against single individuals and families, which could be seen as violating fair housing laws. Rental advertisements cannot specify that only couples are allowed, as this could unfairly exclude other potential tenants based on their relationship status.