For me, it's a passion. I have no other hobbies. I don't fish or hunt and I not a sports fan unless there are rubber tires and spark plugs involved. With the exception of NASCAR - that's 4 wheel yacht racing, not car racing. Sorry, that's me.
It's also the huge circle of friends and acquaintances I have accumulated over the decades of riding that keeps me in. In fact, most all our friends are riders.
Riding for me is also a cerebral douche. When riding, I am concentrating so thoroughly on the ride, that other cares evaporate from my mind.
At 84, I have no intention to stop riding, or slow down - whatever vehicle it takes to do so. And have fellow riders in their 70s and 80s who are cut from the same cloth.