Hi Lavender
Bits of your posts sound very familiar to me (got our kitten 3 weeks ago, had a slight name change) our little girl is now almost 10 weeks now and our oldboy (14 years) isn't interested in her, but is a bit more tolerant. He too does the nose thing with her, then just walks away.
Kitten tried to jump on him and got a hiss and bat on the head, first time from oldboy, but it did make her back off.
Oldboy is fine with me and DH, eating well etc, spends most of his time upstairs away from kitten, but always did do this before she came. He doesn't seem sad, just a bit grumpy when he is too near her.
Oddly, our adult DD has been with kitten the most, and kitten sleeps in her room, oldboy is not happy with DD at all and won't cuddle her now! It's almost as though he thinks kitten is hers and DD has betrayed him.
I do think things will improve over time, but can see kitten and oldboy may never be 'friends' as such. As long as they can tolerate each other and oldboy doesn't leave home that's good :)
Is your kitten flying round the room at top speed climbing on everything? Ours never stops, stalks anything that moves, and anything that doesn't! She exhausts me just watching her, but she is sooo cute!