Yes, you can go at your own pace. Some of the movements are fast though. I'd try some of the silver sneaker classes at the other locations. Geared for seniors!
Unless you happen to get someone who attended these classes we probably wouldn't know. Your best bet is to contact the 24 Hour Fitness you are considering attending and ask the staff. I think that's your best bet for a definitive answer.
I have never taken a zumba class. I wish i could help. Maybe you should try F45 on Walnut. Camron the owner there is amazing and really helps people of all ages at whatever pa e works for each person.
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