I bought my '96 ST1100 last November with 112k on it and it runs like a sowing machine.
Well, only faster, I've never seen our sowing machine move an inch from its place on its on power...
When I asked about its "high" mileage on this forum before I bought it, I got similar responses, some people telling about ST1100's with 250k on them that get the snot ridden out of.
Now from my own experience I can tell you that at 50k, your (future) bike still has a LOT of life left in it. If properly maintained, it is barely in its puberty.