Are you saying numbness isn't normal??? Lot of good suggestions - but here's one - get a bike that keeps you in a more neutral position. Approaching fifty yo riding a GXSR 750 is certainly more challenging then it use to be, however when I ride sports I concentrate on good posture like your Mom always told ya. Your back is better suited to support your weight... Wrists and hands are pretty feeble at supporting weight - add vibration, grip pressure etc. and numbness is par for the course on sports. Some folks 10 miles, some 100, and some 1000. But it usually effects everyone somewhere along the line.