I had the same situation once when I rescued a kitten from the street. None of my resident cats (four of them) liked her. Over the years she drove two of them away (that's when we still lived in a house with garden and they went outdoors). If I had known that I would never have taken her in. But I thought they would get along in time. The third one she fought with until the day he died (but that wasn't her fault). Only with the fourth one she has made friends and they are best buddies now.

It is a very difficult dituation. Cats are very territorial, so for a start I would advise you not to force them to be close to each other, for example feed them in a seperate room with doors closed, so that they at least can eat in peace and without stress. Maybe if they both realize that the other is not coming anywhere close to their food bowl that might take the edge off.

Are they both male, both female, or different sex? If they are both of the same sex, get them spayed/neutered as soon as possible, otherwise the fighting might never stop. If they are male and female ... well that's up to you.

Apart from eating apart I would also at first cuddle and play with them seperately and start only much later to try to get them involved in play together.

Since the younger one is the resident one make sure she gets to keep her favourite places, toys and habitual quality times with you.

I know one site with more tips, maybe it'll help you:
http://www.cathelp-online.com/qinfo/intro.php

Good luck to you all!

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