For all my teen/adult years (I'm 80), I've been interested in most everything. I've been a voracious reader since I was a child, and read some every day. I've also found that I can learn something from most everyone - and not just from professionals. I enjoy talking with service folks, technicians, and the like as much or more than the "higher ups".
I've had/have all kinds of hobbies, and a very wide span of interests. My Wife does too, so that is a nice connection.
It's funny, I know folks without hobbies or special fields of interest and it just baffles me. But these folks (some are relatives) live on gossip and drama and socializing. Count me out for that.
One last thing, until maybe 20 years ago, I thought most folks were like me, but it turns out that isn't true. In example, I had a long term "email friend" and we shared a common interest in model railroading. We talked a couple times daily for years. He was also an avid golfer, and I don't golf. But I would always listen to what he had to say, and ask questions and show a true interest in his other hobby. Yet, I never had an inclination to play.
On the other hand, I have an avid interest in auto mechanics and firearms. When I would talk of either of these subjects, he would ignore me or knock my enthusiasm.
It was inevitable, but one day I did something he didn't like (forwarded his video of his trains to a 3rd party) and that was the end of a long friendship.