I wouldn't say it is loud. It does have a small motor-like noise when it goes across the floor, similar to what a wind-up toy car would make.

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VealindGiGwi Interactive Cat Toys Auto Moving Mice with Lifelike Squeaky Sound Mouse Toy (Pink Ear)

Q: Where can I find replacement batteries?

The mouse uses CR2450 batteries. I bought a pack of 20 replacement batteries on Amazon (https://www.amazon.com/gp/product/B013VOL2YY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) for $8.95, but you can buy them in smaller quantities as well. This was just the best value.

Q: Is it good for 18year old cats

Sure if your cat still wanna to catch mouse.

Q: How do you get it to work???? have inserted and reinserted battery at least ten times, both ways

Ours came with a spare battery and they both ran down super fast. Not sure whether this toy eats battery power rapidly or possibly the batteries were old or even if it uses battery power if the on off switch is left on between uses, althought it will be perfectly still, but just got a 20 pack of batteries and will update this review in a couple weeks, BTW, our 14 year old cat loves the way it starts and stops when he pokes it. And the small noise the motor makes grabs his attention to the mouse.