Story highlights Biden said the campaign wasn't focused enough on the issues

He said he was not planning or organizing a 2020 bid

Washington (CNN) Former Vice President Joe Biden continues to say in interviews that he isn't actively planning a presidential run in 2020, but he's notably avoiding ruling it out.

"I'm not closing the door. I've been around too long," Biden said on NBC's "Today" Monday morning as part of a publicity tour for his new book , "Promise Me, Dad: A Year of Hope, Hardship, and Purpose."

"I'm a great respecter of fate ... but who knows what the situation is going to be a year and a half from now. I don't have any idea. I'm in good health now. I'm in good shape, knock on wood, as my mother would say. But I just, I don't know."

The former vice president will be 75 years old this month, making him almost four years President Donald Trump's senior. In an interview with Oprah Winfrey that aired Sunday, he pointed to his age as a reason for his uncertainty.

"I'm -- thank God right now -- in awful good health," Biden said. "But I don't know what the things are going to be two years from now."

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