What Age Does Knee Arthritis Usually Begin?

Knee osteoarthritis is the “wear and tear” type of arthritis. It happens as the cartilage in the knee slowly thins out. Most people start noticing symptoms between their mid-40s and 60s. The condition becomes more common with each decade after that. The Arthritis Foundation notes that symptoms usually show up in adults over age 50. But the joint changes behind those symptoms can start years earlier, often without any pain at all.¹ Knee arthritis in your 30s is possible too, though it is less common. This is more likely after a past injury or years of hard physical activity.

A General Age Timeline

• Ages 30 to 40: Early cartilage changes may start quietly, often after a past injury or repeated joint stress.
• Ages 40 to 50: Morning stiffness or occasional swelling becomes more noticeable for some people.
• Age 50 and older: Knee osteoarthritis becomes much more common.

This timeline is just a general pattern, not a guarantee.

Why Knee Arthritis Can Start Earlier for Some People

A few factors can move the typical timeline earlier, sometimes by decades.

• Old knee injuries: A past ACL tear, meniscus tear, or fracture can lead to arthritis that shows up even in your 20s or 30s.
• Genetics: If a parent or sibling had knee osteoarthritis, your own risk may be higher and may start earlier.
• Repeated stress: Kneeling, squatting, or heavy lifting at work or in a hobby adds stress that can speed up wear on the joint.
• Body weight: Extra weight adds pressure to the knees with every step. This is one of the risk factors you can change. Learn more in our guide to knee osteoarthritis causes.
• Inflammatory conditions: Rheumatoid arthritis is not caused by wear and tear. It can start at almost any age and is worth mentioning to a specialist.

Learn About Your Knee Pain

Early Signs of Knee Arthritis to Watch For

Symptoms usually build up slowly. They do not show up all at once. Many patients first notice the early signs of knee arthritis during normal daily movement, not during exercise. These signs include morning stiffness, mild swelling that comes and goes, a grinding or clicking feeling, and aching that gets better with rest. Our guide to knee osteoarthritis symptoms covers these patterns in more detail. If left unchecked, mild symptoms can slowly turn into daily pain, a pattern outlined in our overview of the four stages of knee osteoarthritis.

What You Can Do If You Notice These Signs

If a few of these signs sound familiar, especially if you are younger than the typical age range, talk to a specialist rather than waiting it out. A specialist can help confirm if your symptoms point to osteoarthritis, an inflammatory condition, or something else.

A few simple steps may help with mild symptoms: low-impact exercise, keeping a healthy weight, supportive shoes or a brace if your doctor suggests one, and avoiding activities that always bring on pain or swelling.

For symptoms that do not go away, physical therapy is often the first step. If symptoms get worse despite over-the-counter pain relief and physical therapy, a specialist may suggest a minimally invasive option called genicular artery embolization (GAE). Our comparison of GAE and physical therapy explains how the two approaches differ. A 2024 study in the Journal of Vascular and Interventional Radiology found that most patients who responded to GAE still had good results two years later.² A specialist can check if you may be a candidate.