Short answer: knee pain after 40 is common: some stiffness and aching with use becomes more common from the mid-40s, and osteoarthritis is the most common reason. A GP may suspect it if you're 45 or older, the pain gets worse with use, and morning stiffness is absent or lasts under 30 minutes.[2]
Knee pain after 40: what to know
Worth checking sooner
Stiffness that lasts a long time in the morning (it can point to another condition such as rheumatoid arthritis), pain at night or at rest, a hot, red or badly swollen knee, or a knee that locks or gives way.[1][2]
What helps day to day
Osteoarthritis is long term and can't be cured, but it doesn't necessarily get worse and can sometimes gradually improve.[2] Exercise, a healthy weight and suitable footwear are the main everyday supports.[2]
Sources
Written by the Prife iTeraCare team and last reviewed on 9 October 2026. This is general information, not medical advice, and it does not replace your doctor or physiotherapist. A session is a wellness experience, not a medical treatment.
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