Keeping your knees healthy into your 60s, 70s, and beyond comes down to a handful of habits you can start at any age. Roughly 1 in 5 adults over 55 in the United States already live with knee osteoarthritis, so the goal isn’t to defy biology entirely but to slow down the wear that makes knees stiff and painful. The good news: the most effective strategies are simple, free or inexpensive, and well supported by research.
Why Knees Wear Down With Age
Understanding what’s actually happening inside the joint helps explain why certain prevention strategies work. Knee cartilage, the smooth tissue that cushions the ends of your bones, undergoes predictable changes over the decades. It gets thinner. Its surface develops tiny cracks and fraying, starting at the outermost layer. Proteins in the cartilage accumulate chemical byproducts called advanced glycation end-products, which stiffen the tissue and make it more brittle. Calcium-containing crystals also deposit in aging cartilage, further reducing its flexibility.
At the same time, the balance between cartilage repair and cartilage breakdown shifts. Younger joints constantly rebuild their cushioning material. Older joints lose that efficiency, so the protective layer erodes faster than it’s replaced. None of this is inevitable in a dramatic sense, but it does mean the knee becomes less forgiving of excess stress, poor alignment, and weak supporting muscles.
Build Strong Quadriceps
If there’s one piece of advice that shows up most consistently in knee research, it’s this: strengthen your quadriceps. These four muscles on the front of your thigh are the primary stabilizers of the knee joint. When they’re weak, the joint absorbs more impact with every step, and your balance suffers. Studies of people with knee osteoarthritis show that greater quadriceps strength correlates directly with less postural sway, meaning you’re steadier on your feet and less likely to fall or land awkwardly.
You don’t need a gym membership. Bodyweight exercises like wall sits, step-ups, and straight-leg raises are effective starting points. Seated leg extensions with light resistance work well too. The key is consistency: aim for two to three sessions per week, and increase resistance gradually. If you already have some knee discomfort, start with exercises that don’t require deep bending, like straight-leg raises while lying on your back.
Keep Moving With Low-Impact Exercise
Exercise protects knees, but the type matters. High-impact activities like running on pavement or jumping drills place repetitive force on the joint. Low-impact alternatives deliver the same cardiovascular and muscular benefits with far less stress on your cartilage.
Some of the best options:
- Pool exercise: Swimming laps, water aerobics, or simply walking in waist-deep water. Buoyancy takes your body weight off the joint while the water provides natural resistance.
- Stationary cycling: Start with a few minutes at the lowest resistance and build up. Once 15 minutes with no resistance feels easy, add a little.
- Short brisk walks: Three 10-minute walks spread throughout the day deliver the same aerobic benefit as one 30-minute walk, with less cumulative pressure on the knees.
- Tai chi: Not a cardio workout, but excellent for balance, coordination, and the kind of neuromuscular control that keeps knees tracking properly.
The general target is 150 minutes per week of moderate-intensity activity, but don’t let that number intimidate you. If you’re starting from zero, even a minute counts. Build gradually. Progress from one minute to two, from five to ten. The worst thing for aging knees isn’t moderate exercise. It’s no exercise at all.
Train Your Balance and Coordination
Muscle strength alone isn’t enough. Your nervous system also needs to know where your knee is in space and how to react when you stumble on uneven ground. This ability, called proprioception, deteriorates with age and has been linked to the early stages of osteoarthritis development.
A meta-analysis of randomized controlled trials found that proprioceptive training relieves knee pain and improves physical function during daily activities. Effective programs combine balance exercises with coordinated trunk and lower-body strengthening, performed three to four times per week for 30 to 40 minutes per session. Practical examples include single-leg stands, tandem walking (heel to toe in a straight line), wobble board exercises, and step-over drills. These exercises train your muscles to fire in the right sequence, reducing the kind of awkward, off-center loading that wears down cartilage over time.
Lose Weight (or Maintain a Healthy Weight)
This is where the numbers are striking. Research published in Arthritis & Rheumatism found that each pound of body weight lost results in a four-fold reduction in the load on the knee per step. Lose 10 pounds and you take roughly 40 pounds of compressive force off your knees with every step you take during daily activities. Over the course of a day, that adds up to thousands of pounds of cumulative stress removed from the joint.
You don’t need to reach an idealized body weight to see benefits. Even a modest 5 to 10 percent reduction in body weight can meaningfully slow cartilage loss and reduce pain. The combination of dietary changes and low-impact exercise tends to be more effective than either approach alone, because exercise preserves the muscle mass you need to keep the joint stable while the calorie deficit reduces the load on it.
Eat to Reduce Inflammation
Osteoarthritis isn’t purely a mechanical problem. Chronic low-grade inflammation plays a significant role in cartilage breakdown, and what you eat can either feed or fight that inflammation.
An anti-inflammatory dietary pattern emphasizes unrefined, minimally processed foods that are naturally rich in fiber, healthy fats, and plant compounds called polyphenols. In practical terms, that means eating more fruits, vegetables, herbs, spices, olive oil, nuts, seeds, and fatty fish. These foods provide omega-3 fatty acids, which directly oppose the inflammatory pathways that damage cartilage. Polyphenol-rich foods like berries, leafy greens, and extra-virgin olive oil neutralize free radicals that contribute to joint tissue damage.
Equally important is reducing omega-6 fatty acids, found heavily in processed vegetable oils, fried foods, and many packaged snacks. A high omega-6 to omega-3 ratio promotes inflammation and has been linked to increased risk and severity of osteoarthritis. You don’t need to eliminate omega-6 fats entirely, but shifting the balance toward omega-3 sources makes a measurable difference. A feasibility study of an anti-inflammatory diet for knee osteoarthritis showed that participants were able to decrease their saturated fat intake while increasing their consumption of healthier monounsaturated and polyunsaturated fats over just nine weeks.
Consider Glucosamine and Chondroitin
These two supplements are among the most studied for joint health. A recent systematic review concluded that glucosamine and chondroitin are generally effective and well-tolerated for managing osteoarthritis and joint pain. The evidence shows they can reduce the rate of cartilage breakdown, slow joint space narrowing (a measure of cartilage loss on X-rays), and lower markers of cartilage degradation. Chondroitin in particular has been shown to reduce both cartilage volume loss and bone marrow lesions in knee osteoarthritis patients starting as early as six months after beginning supplementation.
The standard dosing supported by research is 1,500 mg of glucosamine and 1,200 mg of chondroitin per day, divided into two or three doses. These aren’t overnight solutions. Most studies showing meaningful cartilage preservation followed participants for six months to several years. If you try them, give them at least three to six months before judging whether they’re helping.
Wear Supportive Footwear
Your shoes directly affect how force travels through your knee. Worn-out, flat, or unsupportive footwear allows the foot to roll inward or outward with each step, which changes the alignment of the entire leg and concentrates pressure on one side of the knee.
Look for stability-type sneakers with a rigid sole and supportive insole. A slightly curved “rocker” sole is particularly helpful because it distributes your body weight more evenly as you walk. Most major sneaker brands (New Balance, Brooks, Saucony, Asics) make this type of shoe, so they’re widely available and don’t require a prescription. If you have more significant alignment issues, a podiatrist can fit you with custom orthotics, but for most people, a good supportive walking shoe makes a noticeable difference.
Avoid spending long periods in heels, flip-flops, or completely flat shoes. All of these alter your knee mechanics in ways that add up over years.
Set Up Your Workspace for Your Knees
If you sit for hours at a desk, the position of your knees matters more than you might think. Sitting with your knees sharply bent or tucked under your chair increases pressure on the kneecap and the cartilage behind it.
Adjust your chair height so your feet rest flat on the floor and your thighs are roughly parallel to the ground. If you can’t get your chair low enough, use a footrest. Make sure there’s enough space under your desk for your legs and feet so you’re not forced into an awkward position. If your desk is too high and can’t be adjusted, raise your chair and add a footrest to compensate. Avoid storing boxes or bags under the desk, which forces you to sit off-center or with your legs cramped. Every 30 to 45 minutes, stand up, straighten your legs, and take a short walk. Prolonged static positions stiffen the joint and reduce the circulation of fluid that nourishes your cartilage.