Most people don't want to hear this, but if the tremors are not totally neurological, you can reduce the effects or often eliminate them from resistance training- i.e. lifting weights.
It's a use it or lose it approach. The nervous system adapts to both usage by becoming more efficient and decays in it's ability to transmit signals with lack of use.
Have a 54 yr old karate student with MS. The doctors have been amazed at the way her system is adapting since she started classes. Even though she has had more lesions on the brain tissue appear, the docs tell her there has been much less decay in her abilities than they see in other patients. In fact, even though the lesions have increased, the decline in her motor skills came to almost a complete standstill since she started (3 years).
I have had other people tell me they notice they are steadier since starting class.
Shakes do not have to be a definite result of aging, just like a loss of balance does not have to accompany aging either- if you keep exercising as you age.
I'm not as far along as some of you guys, but at 52, I ain't no spring chicken either.
My karate teacher and good friend is 71 years old and has incredible balance, fantastic speed, and only gets the shakes when he doesn't get enough sleep. He can outshoot everyone I know even at his age (he's a retired Marine).
Here's a question for ex military that aren't as steady as they used to be. How much PT do you do these days compared to what you were doing in the military?