At age 84, Milt Horowitz is a scrappy fellow.

He’s not one to get pushed around.

The retired mathematics teacher from Montclair is very active, taking classes in music, sculpture and even running for a seat on his local board of education this November.

But he also has tight hip flexors, weak ankles and kyphosis, a condition where the spine curves. That’s why he goes to physical therapy. But at a recent visit, he had a surprise.

When he tried to pay his co-pay with cash, the business — Parabolic Montclair, which also has facilities in Hackensack and Little Falls — refused to take the payment.

“The employees said it was their policy not to accept cash. Credit card or check only,” Horowitz said of the Sept. 19 visit.

He was perturbed, noting that U.S. bills say: “This note is legal ten

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