Here is my 8 year old cat Starlet and our new addition Luna, who is growing fast at only 4 months.
It took a while to get them both to settle, especially the older one. The kitten is way too excitable however helps bring out the playfulness in the older one.
They share very easily, food, trays, and toys. Although Starlet is older she hisses at being awoken vs to attack. They love eachother however in moderation. Like people then :)