I don’t know if I’m feeling old or if my colleagues’ youth has me perplexed.

I went to work this week carrying a book to read during some down time. It’s Douglas Brinkley’s biography, “Cronkite.” A young colleague sitting next to me who, I guess is perhaps in her late 20s, looked at the book and asked, “What are you reading?”

“Cronkite,” I said. “Oh,” she answered. “Who’s he?”

“Um, he would be Walter Cronkite,” I said, adding that he was a renowned news anchor and broadcast journalist.

“Oh, I see,” she said. “Is the book good?” she asked. Well, yes, I answered.

In fairness to my young colleague, Cronkite retired from CBS News in 1981, more than likely before she was born. He kept a fairly low profile in the years since his retirement, although he did produce some news and science specials for CBS until his death in 2009.

The brief exchange just reminded of me of how quickly this ol’ world has changed – and continues to change.

I’m trying to stay current. Honest.

At times it’s tough to let go of what – and who – got us to where we are today. Walter Cronkite, once called the “most trusted man in America,” was one of those who led us to this point.