From the Avis RACAM, the bible of rules and regulations. Spouses over the age of 25 are allowed to drive. If a particular location is allowing that, it is either a privately owned agency (not cendant corp owned) or is not in the US.
Originally Posted by cricketer
I asked again at the rental counter, and they told me the age didn't matter for a spouse - they are always automatically permitted on the rental.