There has never been a more interesting time to be alive. It's not just about living longer, it's about the possibilities that exist for everyone of us if we embrace the challenges of aging and make a point to live life to the fullest.

One of the most vibrant and challenging voices out there is living proof that life is all about looking to the possibilities.

He's a writer, psychotherapist and he's been HIV positive for more than 25 years.

In his new book, "The New 60: Outliving Yourself and Reinventing a Future," Robert Levithan explains why being unreasonable is necessary to survival.

He says he wants you to forget the notion that we have an expiration date. It's unreasonable but by focusing on the possibilities in life, you'll focus less on what could go wrong.

Robert explains how he discovered his HIV diagnosis in the 1980s before tests were widely available and what he thought when everyone told him he was going to die.

He says he comes from a long line of family members who survived the unsurviveable, which is why he always believed in the possibility that he wasn't going to die just because he had the disease.

Robert says he shares his story because it's an example of what's possible. He says he's not that special -- he's just had good luck, good fortune and a willingness to keep going.

He reveals what he's learned about life while living with a disease and what he hopes people learn from his experiences and his book.

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