Does everyone in a party need to be 62 or over to qualify for the Marriott senior discount?

I'm booking a trip with my mother and mother-in-law, who are both over 62 years old. The hotel we're staying in is a Marriott, which offers a senior discount for travelers 62 and over.

Traveling is one of life’s great pleasures – especially when you take advantage of Marriott’s senior discount. If you're 62 years or older, you can save 15% or more on your room rate at Marriott brand hotels worldwide, seven days a week. So, start planning your trip and plan to save.

What I can't figure out is whether everyone traveling needs to be 62+ or if only one person does. There are specific restrictions mentioned on the hotel's rate information page

Marriott Senior Discount

• Available to guests 62 years of age or older.
• Proof of age eligibility required at check-in.
• Limit of two rooms per night.

Maybe I'm being too literal but I don't want to check in and have them tell us that we can't have the rate for both of the rooms we're booking because only two members of our party are seniors and then charge us the current rate for the hotel.

I found this on another site but it was the only place I've seen it mentioned that only one person has to be a senior and even then it's not 100% clear.

Do I have to travel with a senior to get the discount?

Yes, you sheister. In practice, you won’t get ‘carded’ 100% of the time as it really depends on the mood of the desk agent. Otherwise, Marriott requires valid photo ID showing the date of birth for the senior.

This brings me to my next point. You do not need to book the reservation under the senior’s name in order to get the discount. You can book it and add them as a guest with you. Just be prepared to have the senior’s photo ID showing date of birth for the desk agent.

Is there any official clarity on this?