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will not have transmission problems before 120,000 miles AND before year 15?

It's currently at 75,000 miles and about 9 years old.

 
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That is like trying to predict if the Myan calander is accurate and we all are going to die in December of this year.. If you believe this, than your transmission might outlive all of us.

Only thing you can do is service the transmission and have good driving habits to prolong its' life. If you have not changed your fluid yet then that would be a good start. Use Honda ATF or another of really good quality. I would not do a flush, just change out the 2 1/2-3 quarts in shorter intervals. The transmission plug will only allow out that much per time and your transmission holds around 9 quarts. Also allow the engine time to warm up (therefore warming the transmission) before driving off in cold climates. Warming it up and accelerating slower allowing for easy shifts will reduce unnecessary wear.

 
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Why is flushing bad?

How often are you supposed to change the transmission fluids? I changed mine the first time at 60,000 miles/6 years back in 2009. Is that bad? When should I do the next fluids change? It's only 75,000 miles now.

 
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Flushing the transmission is not necessarily bad; there is a lot of mixed thoughts on it though. There has been many coincidences when it was done that the transmission started failing shortly after. Probably the biggest factor is the tranny was already on its' last leg; this was just a finishing factor.

You seem awfully worried about this and i would not sweat it unless you are having issues already. I have changed transmission fluid on cars for the first time at way over 100k. In most cases the fluid was grimey and the tranny was still operating as it should. People just think to change the engine oil and that's it.

If you are still worried, check the color of the fluid on your dipstick; if it is cherry red that means it is clean and lubricating as it should. If it is looking like slightly used motor oil then it needs a change. Now if it is black, then you might have one on its' way out. I think most manufacturers reccomend changing as often as every 2 years/ 30k miles when subjected to hard usage. Such as mountainous terrain, stop and go(city driving), or driving with a heavy foot. Soo if you are still worried about it then just do it at those intervals..

When you do it next make sure you clean/wipe down the drain bolt since it is magnetic and picks up metal shavings. Don't freak out if there is a little on it; this is normal and just what happens to a wearing transmisison. Lastly, don't be like the idiots that reverse out of their driveway and put it in gear while still moving backwards.. Always come to a complete stop.

 
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I would be alot more worried if it's a 2001 or 2002 Civic. But, with a 2003, there is still a risk, although less compare to the other two, that the transmission will fail before 120,000 miles.