Malcolm Forbes rode into his seventies. Don't sell yourself short.
I am now 42, and have been riding long enough to lose more than a handful of friends to motorcycle accidents. Each time I reevaluate my riding style and the risks I am taking. I no longer ride like the scooter trash in "Mad Max", but I don't ride like a tenuous newbie. I've had the pleasure of riding everything from race replica sportbikes to cruisers to classics and dual sports.
As I impied, my riding has changed from all around rickey racer to backroad rickey racer to backroad tourist as time has gone by. I dabbled in racing when I was younger, and had a trackday bike until recently. Now I focus more on destination trackdays, renting a bike from the provider while my family enjoys local attactions for the day. Sure I don't put my bike and body on the line at the track like I used to, but I still get a kick out of it, and I try do it enough to keep the skills sharp. But I go through my trackday prep workbook before each date, partially as a reality check to remind myself how long it's been. My backroad bike is a classic bike I bought from my Dad, so when riding it I have the "don't dump dad's bike" mindset, even though I pay all the bills
I absolutely love riding. I am unhappy when I go too long without riding
something. Motos, bicycles, my wife, whatever. But I understand about the entropy of the human body and its systems. It's part of the deal of being human. I tell myself that I will listen to not only myself, but the the judgment of my loved ones regarding riding and when it might be time to quit. But I'll fight it to the end. I'll get one of those three wheeled Piaggio scooters, if I have to.