I think that some maybe grip the throttle too tight. Try relaxing your hand. Another thing that might help some older guys is to buy a hand held spring grip which can be purchased at any sports store. Exercise your hands with this and build up the muscles in your hand and wrists.It only takes a few minutes every day while you are sitting around. Most older people lose muscle mass as we normally don't work as much. I do this with both hands while watching TV. Start with as many sqeezes as you can do without hurting yourself and over time you will be able to increase the numbers as your hands and wrists get stronger. It takes quite a while to build muscle as we age but now I can hold the grip for hours with no problem.