That description seemed ambiguous to me too, so I called the phone number on the Marriott Senior Discount information page.
The representative told me that as long as one person is 62 or over, the room itself qualifies for the senior discount, regardless of the ages of the other members of the group.
She also said that if two people in the group are at least 62, you can have two rooms at the discounted rate, and it doesn’t matter how old the people are who actually sleep in either room. Two is the maximum number of rooms allowed under that part of the policy. After that, a senior would have to sleep in any additional rooms.
Anyone in the group can make the reservation, and pay for it, as long as they give the name and age of the senior. When checking in, the senior must sign for the room and present their identification.
Credit:stackoverflow.com‘