Whose home this still is
For your senior cat, the house is a known map of warm spots, quiet corners and predictable people, and a kitten rewrites that map overnight. Kittens play by ambush, chase anything that moves, and treat a sleeping older cat as the most interesting toy in the room. An elderly cat with stiff joints and thinner reserves cannot shrug that off the way a younger adult would. The goal is not to make them playmates — it is to let the kitten grow up alongside her while her sleep, meals and favourite places stay genuinely undisturbed. If friendship comes later, it comes because she was never overwhelmed at the start.
Set up two households under one roof
Begin with the kitten living in one closed room with its own tray, bowls, scratching post and bed, while your senior cat keeps the run of the rest of the home exactly as before. Do not move her bowls, tray or bed to make room; her routine is the anchor that tells her nothing essential has been taken away. Swap scents before faces: rub a soft cloth on each cat's cheeks and leave it near the other's food bowl, so the new smell arrives paired with something good. Feed them on opposite sides of the kitten's closed door for a few days, letting curiosity build at a distance she controls.
Burn off kitten energy before any meeting
The single biggest favour you can do your senior cat is to play the kitten hard — with a wand toy, a crinkle ball down a hallway, a cardboard box to dive into — before the two cats spend time together. A kitten who has just hunted, chased and wrestled a toy for fifteen minutes investigates an older cat far more politely than one bursting with unused energy. Keep first meetings short and in a room where the senior cat has a clear exit and a raised perch the kitten cannot yet reach. Let her watch, leave, or ignore; never carry her toward the kitten, and end the session while things are still boring rather than after a hiss or a chase.
Guard her rest, food and litter access
Kittens steal, without malice, the three things an old cat needs most: sleep, food and an unhurried tray visit. Feed the cats separately behind a door so she can eat slowly without a youngster diving into her bowl, and keep at least one litter tray in a kitten-free zone she can reach at night. If the kitten pesters her during the day, give the kitten a distraction and lift the kitten away — never scold the senior cat for growling, which is her clearest polite request for space. Watch her appetite, hiding and litter habits over the first weeks; eating less or avoiding whole rooms means the pace is too fast, whatever the kitten thinks.
A household that follows the same rules
Introductions fail most often because one person lets the kitten into the senior cat's room as a surprise while another is carefully staging meetings. Agree the quiet zones, the feeding doors and the meeting routine as a family, including what children should do when the kitten escapes — scoop up the kitten, not the old cat. Over weeks, as meetings stay calm, let shared time stretch naturally and keep the separate retreat permanently available even after they seem settled. Your senior cat's profile can be opened by the relatives you pick through KinsLe Family Sharing.