I'll shortly be 59. Getting to where it's harder to start higher compression bikes either at all, or without messing up my back for a week. Thankfully, I have a perfectly functional MkIII Interstate and the Dreer monoshock prototype with MkIII engine. Extrapolating from the past 20 years, I'm good for another 20 years I believe (maybe 30 if I'm careful). Oh, yes, I also have a set of DocZ rollers!
I posted the above bit before reading through all of these. Good stuff, so I'll fill in some blanks.
Riding for over 45 years, owned 152 bikes in that time. Still have:
13 Triumphs
6 Nortons
3 Kawasakis
2 each BSA and Honda
1 each Triton, Moto Guzzi and Rickman Montesa.
I've completed 14 custom bike builds (7 of them Nortons), 20 restorations (6 of them Nortons), 3 salvage rebuilds, 19 major refurbs (2 of them Nortons), 18 stand-alone engine overhauls (4 of them Nortons), and 31 rollers scratch built from spare parts (5 of them Nortons). I am finally out of signiticant parts to do another build from scratch, and am trying to focus on completing 3 major restorations that I've started over the years (2 Triumphs and a Honda).
Regular modern ride alternates between 2000 Triumph Legend 900 triple (70%) and 2003 Kawasaki ZRX1200R (30%)
Regular classic rides alternate between 75 Commando Interstate MkIII (60%), 70 Triumph Bonneville (20%), 66 Triton (20%)
I ride a half-dozen other classics, and one other modern, intermittently now and then. The rest (apart from the 3 restoration projects and 3 non-running rollers) need to be woken up, and I don't have time for that any more.
The highlight of my time riding started in 2007 when I treated myself to obtaining a racing license on my 50th birthday, on my scratch-built, bone stock 66/67/68/69 Triumph Bonneville 650. I raced the Sandia Classic in Albuquerque, and the season finale at Barber's. Finished in the top half of all competitors that year, only racing my first 2 meets. In 2008, I was blessed to race at Roebling Road, GA, Daytona, Road America, Grattan, MI, made a pass on the Bonneville salt flats setting my class record, then Miller Motorsports Park, Sandia Classic, and Barber's. Finished the season 5th out of 20 competitors, only racing 2/3 of the events, against 750 triples & fours, and much more experienced riders (I attribute that to my trusty Bonnie more than my abilities). In the latter half of '08, I also got to race a borrowed Formula 500 Kawasaki H1R, on which I clinched 3rd place in the championship racing less than 1/2 of the events, and against STIFF competition. Also got to race at Willow Springs in 2010 on my Bonnie, and in Formula 1 sidecar (two wins in F1S); Rick Murray, the sidecar owner, clinched the championship that year with some help from our finishes together. Perhaps one of these days I'll get to race again...