An elderly cat with little patience is not being difficult when she hisses or swats at a kitten. She is setting a limit in the only language she has, and a boisterous kitten who keeps bouncing back can turn that limit into real fear or a fight. Your job is not to make them play together, but to teach the kitten that the senior cat is a companion for calm moments, while exciting play happens with you.
Read the older cat's patience honestly
Watch the resident cat's body before you judge any meeting. Ears flattening, tail lashing, skin rippling, a low growl, or pointedly moving to a higher or separate spot all say she has had enough, even if the kitten reads it as part of the game. Note where she chooses to rest when the kitten is active, because those spots should become protected territory. A senior who once enjoyed company may simply have stiff joints and thinner tolerance now, and being pounced on can genuinely hurt.
Be the exciting playmate yourself
Drain the kitten's hunting energy away from the older cat. Run two or three short wand-toy sessions a day that mimic stalk, chase, catch, and then a small meal, which completes the sequence kittens crave. End while she is still engaged rather than frantic, because an over-aroused kitten is the one who launches at a sleeping senior. Keep hands out of play entirely, since a kitten taught that fingers are prey will try the same bites on the older cat's ears and tail.
Shape calm behaviour around the senior
Reward the moments you actually want repeated. When the kitten sniffs the elderly cat and turns away, approaches slowly, or settles nearby without touching, mark it with a soft voice and a tiny treat. The second a pounce is aimed at the senior, redirect without scolding: slide the wand toy across her path and draw the chase elsewhere. If she cannot settle, give her a cheerful time-out in her own play space rather than letting rehearsals of ambush become a habit the older cat must endure. Parallel feeding can soften the relationship faster than play management alone. Feed the two cats at the same time on opposite sides of a door or baby gate, close enough to smell each other but not to compete, and move the bowls fractionally closer across calm days. The senior learns that the kitten's presence predicts dinner rather than ambush, and the kitten learns that good things happen when she is still and quiet near the older cat. Stop the pairing for the day if either cat stops eating and stares instead.
Protect rest, food, and litter areas
Set the home up so the senior never has to compete or flee through the kitten to reach essentials. Her food, water, litter tray, and favourite sleeping spot should sit in a zone the kitten is kept out of during unsupervised hours, ideally with a high perch or a doorway she can use and the kitten cannot yet follow. Keep early time together supervised and brief, expanding it only as the kitten proves she can disengage. KinsLe Care Teams helps everyone in the home follow the same supervised-play times and quiet-zone rules, so the kitten's gentle habits hold whoever is on duty.