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Feline arthritis is one of the most under-treated problems in older cats. Studies suggest the large majority of cats over 12 have arthritic changes on X-ray, yet most owners never notice, because cats don't limp, they simply stop doing things. The cat that no longer leaps onto the windowsill isn't lazy, it's sore.
Once you know to look for it, a joint supplement is a gentle, low-risk way to support an older cat's mobility.
Cats evolved to hide weakness, so they mask pain until it's significant. Instead of an obvious limp you get subtle changes: sleeping more, jumping less, a scruffier coat because twisting to groom hurts, sometimes grumpiness when handled. If your older cat has quietly stopped getting up high, arthritis is a strong candidate.
Green-lipped mussel is the ingredient to prioritise for cats. It's well tolerated, brings anti-inflammatory omega-3s, and comes in cat-friendly formats. Glucosamine is often included too.

Green-lipped mussel support formulated for cats. My default recommendation for a stiff senior cat.
Check Price on Amazon →A plain green-lipped mussel powder you mix into wet food suits cats who won't take tablets.
Check Price on Amazon →The higher-strength feline capsule, £29.28 for 60 direct. Capsules can be opened and stirred into wet food.
Check Price on Amazon →The standard feline formula, £27.14 for 60 capsules direct. Start here for a cat that is slowing down but not yet obviously stiff.
Check Price on Amazon →Alongside a supplement, small changes make a big difference for an arthritic cat: a litter tray with a low side, steps up to a favourite spot, and warm, soft beds. Ease the environment and the supplement has less to fight against.

Yes, and it's very common. Most cats over 12 have arthritic changes, though few show an obvious limp. They stop jumping and slow down instead.
A cat-specific green-lipped mussel product like YuMOVE Cat Joint Care is a sensible first choice. Always use a feline formula, not a dog one.
Watch for stopping jumping up, hesitating at stairs, sleeping more and a scruffier coat. If you see these in an older cat, ask your vet about arthritis and joint support.