A final word on my London trip, then I'm done — I swear.

Among those at this conference I was attending, some big former CEOs and statesmen. People that I had covered years ago — in one person's case something like 20 years ago.

It was that person, and I won't name names, who really struck a chord with me. In his day, he was "the" guy, "the" CEO, "the" mover and shaker. He's just shy of 80 now. But he seems a little sad now.

"You know what's the worst part of being retired," he asked me.

"What?" I said.

"Being retired," he joked.

He missed the game. The challenge. The pressure. The race. He missed it all. It wasn't a money thing — he clearly has enough of that. Nor was it simply a power thing — although I think he missed some of that. No, it was a "where do I fit in now?" thing.

And this former CEO was feeling very different from his former self.

We chatted up our numerous conversations and interviews those many years ago, when he was at the center of it all.

He remembered how one time I chased him down a series of escalators at a shareholders meeting, complete with my camera crew in toe.

"You were a challenge, Cavuto," he'd say. "But you know something... I loved every minute of it." Then, as if muttering to himself, he ended, "I miss it." His crinkled eyes looked around the room. They were sad eyes. Remembering happier times.

It got me thinking — boy, things can change.

We live so much in the moment that we fail to see the moment for what it is — just a moment.

Life goes quickly. Fame quicker still. One moment we're the center of our universe. Then suddenly the center of no one's universe — save some family, some friends and a few souls who knew us when we had it all.

And love us still when we don't.

What do you think?  Send your comments to: cavuto@foxnews.com

Watch Neil Cavuto's Common Sense weekdays at 4 p.m. ET on Your World with Neil Cavuto. 

Neil Cavuto serves as senior vice president, anchor and managing editor for both FOX News Channel (FNC) and FOX Business Network (FBN). He is anchor of FNC's Your World with Cavuto - the number one rated cable news program for the 4 p.m. timeslot - as well as the FNC Saturday show Cavuto on Business. He also hosts Cavuto on FBN weeknights at 8 p.m. In addition to anchoring daily programs and breaking news specials on FNC and FBN, Cavuto oversees business news content for both networks and FNC's weekend business shows, including Bulls & Bears, Forbes on Fox, and Cashin' In. Click here for more on Neil Cavuto.