I have a friend who is visiting the country later this year. She wants us to rent something from the Adrenaline Collection for a day

However, I'm not 25. Her aunt is way over 25 though. If I made the reservation and made her aunt an additional driver, would they let us rent the car (perhaps if she drove it off the lot)? This would be at LGA or JFK; I'm only asking because I'm not familiar with the staff there (i.e., out here in SLC I wouldn't have a problem since I know everyone).
(Why doesn't she make the reservation? Because I can get better discounts

)
-J.