The mismatch is about energy and endings, not friendship
A young cat plays the way a kitten learns to hunt: in sudden bursts, with full-body pounces, wrestling holds, and a habit of restarting the game the moment it stops. An older cat usually plays in a different register entirely, stalking slowly, batting from a settled position, and finishing long before a youngster is tired. When those styles collide, the younger cat treats the older one as the most interesting toy in the house, ambushing her during naps and chasing her out of favourite spots. The older cat may tolerate it for weeks and then start hiding, swatting hard, or avoiding shared rooms. Matching their play does not mean making them play alike. It means meeting the younger cat's bigger appetite elsewhere so shared time stays within what the older cat actually enjoys.
Tire the younger cat out before they play together
Run a focused solo session with the younger cat first, using a wand toy that keeps her leaping, turning, and chasing until her pace genuinely slows and she starts watching more than pouncing. Only then invite the older cat into a calmer shared game. A toy dragged slowly along the floor or around a corner suits an older hunter who prefers stalking to sprinting, and the younger cat, already partly spent, is more likely to take turns instead of monopolising every movement. Keep the shared session short and stop while both cats are still loose-bodied and interested. Ending early teaches the younger cat that games with her companion are relaxed events, not the start of a wrestling match she has to win.
Give the older cat exits she controls
Shared play should always happen in a space with more than one way out, never in a dead-end corner or a single doorway room where the older cat can feel trapped. Raised perches, open doors, and furniture she can slip behind let her leave the moment she has had enough, and that freedom is what keeps her willing to join in next time. Never carry the older cat back into a game or hold her in place while the younger one plays around her. If the younger cat redirects onto her companion's tail, body, or sleeping place, calmly end the game and restart the younger cat on a toy in another room. Over time that consistent interruption teaches where the boundary sits far better than scolding after an ambush.
Read the after-effects, not just the game itself
A pairing that looks lively in the moment may still be costing the older cat. Notice whether she eats normally afterwards, uses shared spaces freely, and chooses to rest near the younger cat at quiet times, since cats who genuinely get on often sleep within sight of each other. Warning signs include the older cat waiting until the younger one is shut away before eating, growling when she appears, or spending the day in one hiding place. Those patterns call for more separation, more solo outlets for the youngster, and a conversation with your veterinarian if the older cat's appetite or habits have changed, because pain, especially in joints, often shows first as intolerance of a boisterous housemate. With KinsLe Care Teams, the younger cat's extra solo sessions and the pair's shared games can be assigned as distinct duties, so nobody assumes one game covered both cats.