Well...
I've been studying Ninjitsu for 6 years, which incorporates many aspects of Aikido. I know all about the wrist twists. I've never experienced any extended problems, and many of the people I train with have been at it for 15-20 years, and they seem to be doing fine, sans the occasional injury.
I think you'll probably be fine. Besides, most arthritis/ bone wear/ type issues have proven to be preventable/ reversible as long as you're following a diet that doesn't eat away at the calcium in your bones. No dairy, meat, and eggs, and you're fine.
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"That so few now dare to be eccentric marks the chief danger of our time." -John Stuart Mill RawFoodHealth.net - My raw food website.
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