I turn 51 next month, and I have a 1986 Honda VFR750 (which I love). I'd rock a sportbike if it wasn't such a hassle to carry crap. My grocery getter (1987 Honda Magna) was out of commission, so I had to use my old VFR to go to the gym and such - it was kind of a pain in the butt to wear a backpack, when I had luggage on my old bike to carry stuff. My fat Suzuki C90T carries a bunch, but it's a pig of a bike and loud (I leave for the gym at 5:30am). Sportbikes are sweet, but I find myself liking utility with motorcycles as I get older. My SuzuPig is really for my passenger, anyway. The VFR makes for a horrible passenger bike (as any sportbike does).
I just got a 2009 Vulcan 500 which replaced my '87 Magna. Small, fast, utility. I can put stuff in bags and luggage.
For me, I'm down to get fast and low... it's not the "danger" aspect of sportbikes and my lower back and body is just fine (TRT is an amazing thing), but I'm more into riding for riding's sake, and sometimes the bike style just doesn't suit what riding has become for me these days.
Also, we have a track in San Marcos, TX, but again, it just feels like a hassle to do track days (I've done and ran/organized track days in the past). Also, I ain't racing anymore, so I kinda just let it be.
Riding for me has become "point and shoot" style of riding. Sometimes I gotta be somewhere, sometimes I don't. I want bring my fishing rod and carry stuff like lunch leftovers. Having a significant passenger on the back is awesome. Sportbikes just don't have that utility capacity I like.
Again, I love sportbikes, but I also like fishing. What I like best is riding my motorcycle to go fishing.