97 Honda civic transmission fluid change?

I recently bought a 97 civic with just under 100 k on it. Car was beautiful kept with all service books. The transmission shifts perfectly but I can't find details of when/if it was last serviced. I hear that if you have a old transmission that may have never been serviced its best not to mess with a change as this can cause problems, is this true and also on those older boxes should I still use Honda new fluid or dexron as the book says either. Thanks for the help

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