For other uses, see Atrium. The atrium (plural: atria) is a blood collection chamber of the heart. It was previously called the auricle, and that term is still used to describe this chamber in, for example, the Mollusca, but in humans that name is now used for an appendage of the atrium.
1 Adult children whose eligible parents have or had a USAA auto or property insurance product.*. 2  Widows and widowers of USAA members who have or had a USAA auto or property insurance policy. * Children must be 18 years or older to be eligible for USAA membership and purchase products in their own name.
U.S. Rental Car Company Policies. Minimum age is 21. Age surcharge of $25 per day would apply for drivers between 21-24. More Info. Primary renters must be 25 years old and above in most states. Renters between 21 and 24 years old need to pay an age surcharge of $25 per day.