5 surprising causes of weak legs in seniors—and how to fix them! | August 23, 2025

It’s perfectly normal to feel concerned as you age if your legs don’t seem as strong as before. You might notice it when getting up from a chair or find climbing stairs more challenging than it once was.

While this can feel worrying, the positive news is that learning the reasons behind it is the first step to addressing it. Let’s explore why leg weakness can develop with age and, more importantly, what you can do to keep your legs strong and dependable.

Why Do Our Legs Weaken as We Get Older?

Leg weakness is frustrating, but not something you have to just accept. There are some common causes behind it, and understanding them gives you the power to take action.

1. Muscle Loss (Sarcopenia)

One major factor is sarcopenia, or age-related muscle loss. After the age of 50, it’s typical to lose about 15% of muscle strength per decade, though this varies for each person.

Being inactive speeds up this loss, making regular movement essential to maintain muscle mass and function.

2. Reduced Physical Activity

Another big reason is simply moving less. As people grow older, they may slow down their activity levels, setting up a harmful cycle: less activity leads to weaker muscles, which makes it even harder to be active.

Inactivity can also contribute to poor circulation, joint stiffness, and conditions like type 2 diabetes. Keeping active, in any way you can, goes a long way to maintaining strong legs.

3. Chronic Health Conditions

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