When Bob Nordman’s doctor told him he should start to run to lower his blood pressure at age 33, nobody could have expected what he’d achieve 35 years later.

Nordman, a New Hyde Park resident, completed his 100th marathon Sunday at age 68 in an unofficial time of 4:42. Thirty-five years ago, he would have laughed at the idea of coming anywhere close to this feat.

“After the first one I thought I was done,” he said. “It hurt a lot.”

But Nordman kept running. He became “hooked” on the competition. He once finished in 3:10 in a Long Island Marathon. In 1981, he began to take his show to the road.

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Nordman has finished marathons in all 50 states and Washington D.C. Throughout his travels, he said he’s “met a lot of crazy people, crazier than me.”

He’s lowered his blood pressure and even impressed his classmates at his 50-year high school reunion this year. Nordman said his running lifestyle has allowed him to eat and drink as he pleases — leading to a specific post-race ritual.

A pint of beer. “I’m going to have one in a little while,” Nordman said with a laugh.

And how’d his 100th marathon go? “I feel pretty good,” he said. “Turned out to be not too bad.”

He’s on to marathon 101.