Officially 60, but they don't force an ID
The postings on the box office price listing says that the senior admission is for folks 62 & over however, they don't usually ask to see ID or proof of senior status (AARP, Golden Buckeye, etc.).
Call a reliable source such as AARP or the theater.
I don't think they even check unless you are obviously not over 50.
If you have the card should not be a problem if info is correct.
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