As we age, we naturally begin losing muscle unless we actively maintain it through resistance training and adequate protein intake. Which means the conversation the wellness industry keeps having, smaller waist, smaller appetite, smaller portions, is pointed in the wrong direction for this stage of life.

Building and maintaining muscle supports your metabolism, strengthens your bones, improves insulin sensitivity, protects against age-related muscle loss, and helps you stay active and independent.

In this article, we cover:

1. Why muscle matters
2. Why strength training is critical to your muscle mass
3. Protein matters more as we age
4. Books to support your health journey
5. Answers to common questions
6. References to the scientific research discussed

1. Why Muscle Matters

Your scale doesn’t measure the right thing, it tells you how much you weigh. It doesn’t tell you how much of that weight is muscle. It doesn’t tell you how strong your bones are, how well your body regulates blood sugar, or how likely you are to still be climbing stairs unassisted at 75.

From around the age of 30, we naturally begin losing about 3-5% of our muscle mass every decade.

• Muscle protects your independence. Getting up from the floor, climbing stairs, carrying your own luggage.
• Muscle is a metabolic safeguard. Muscle tissue is one of the primary places your body stores glucose after eating. The more of it you have, the better your body regulates blood sugar.
• Muscle builds bone. Bones respond to mechanical load. When muscle pulls against bone during resistance training, it signals the body to maintain, and even build  bone density.
• Muscle supports mental resilience. Research links resistance training to reduced symptoms of anxiety and depression, alongside improvements in confidence and self-efficacy.
• Muscle helps you recover from illness and injury. Maintaining muscle mass has been linked with better recovery after surgery, illness and hospitalization, making it one of the best long-term investments in healthy aging.

Perimenopause changes the math. As estrogen, which plays a protective role in maintaining muscle tissue, begins to decline, muscle loss speeds up considerably. Research indicates postmenopausal women lose muscle at roughly double the rate of premenopausal women at the same activity level. Strength tends to decline even faster than muscle mass itself, because aging also affects how efficiently your nervous system recruits muscle fibers.

I write more about the effects of Perimenopause, in this Dedicated Article of The Life I Love Project.

2. strength training is critical to your muscle mass

No, You Won’t “Bulk Up”

This is the fear that keeps a lot of women out of the weight room, and it doesn’t hold up. Building significant muscle size requires hormonal conditions, particularly testosterone levels, that most women simply don’t have.

What strength training usually creates is:

• better posture
• improved body composition
• greater confidence
• improved function

Most women look leaner after months of strength training even when the scale barely moves, because muscle is denser and more compact than fat.

Cardio Is Great. But It Isn’t Enough.

I love running.

It helps my mood, cardiovascular health and stress levels.

But running alone doesn’t protect against age-related muscle loss.

That’s why current exercise guidelines recommend combining aerobic exercise with strength training. They complement each other.

You don’t need a complete overhaul. You need a starting point that survives a full calendar.

• Start with two strength sessions a week. Full-body, 30–40 minutes, focused on compound movements, like squats, rows, presses. Consistency beats intensity.
• Track effort. Did you lift more, or with better form, than a month ago? That’s the metric that predicts long-term results.
• If you’re in perimenopause, treat strength training as non-negotiable. The biology is working against muscle retention during this window specifically, which makes consistent resistance training more protective now than at almost any other life stage.

Not ready to join a gym? Start here:

One of the easiest habits you can build today is taking a 10-minute walk after meals. Research shows it can help reduce blood sugar spikes, support metabolic health and complement your strength training routine.

👉 Read: Why a 10-Minute Walk After Meals May Be One of the Best Habits for Your Health.

3. Protein Matters More As We Age

One of the biggest surprises during my research was discovering that the old recommendation of 0.8 g of protein per kilogram of body weight is the minimum needed to avoid deficiency, not the amount that supports optimal health.

As we age, our muscles become less responsive to protein, a process called anabolic resistance.

Experts now recommend around 1.2–1.6 g of protein per kilogram of body weight each day for healthy, active middle-aged and older adults.

Some excellent sources include:

• Greek yogurt
• eggs
• chicken
• fish
• lean beef
• tofu
• lentils
• cottage cheese
• beans
• edamame

Personally, one of the biggest changes I’ve made is asking myself: “Where’s the protein?“

before planning every meal.

Strength is not built through exercise and protein alone. Quality sleep gives your body the time it needs to recover, repair and adapt. You can find practical, evidence-based ideas in my guide to better sleep.

My Takeaway

For years, women have been praised for becoming smaller.

Smaller waist.

Smaller appetite.

Smaller presence.

I’m no longer interested in becoming smaller.

I’m interested in becoming stronger.

Stronger muscles.

Stronger bones.

Stronger health.

Stronger confidence.

Because decades from now, nobody will care what size jeans I wore at 43.

But I hope I’ll still be hiking mountains, carrying my own bags, laughing with friends and living a life full of energy.

4. Books To Support Your Health Journey

1. Outlive – Peter Attia, MD – Best for healthy aging and longevity.
2. Forever Strong – Dr. Gabrielle Lyon – Best for understanding why muscle matters after 40.
3. Next Level – Stacy T Sims – Best for women’s health during perimenopause and menopause.

5. Frequently Asked Questions

Is It Too Late to Start Strength Training at 50 or 60?

No. Research consistently shows that people can build muscle and improve strength well into their 70s and 80s. While progress may be slower than in younger adults, resistance training remains one of the most effective ways to improve health, mobility and independence at any age.

How much protein do I need after 40?

Most current guidance for active midlife and older adults recommends 1.2–1.6g of protein per kilogram of body weight per day, spread across meals.

How often should I strength train each week?

Train each muscle group at least once a week. You can do this most efficiently with two full-body sessions focused on compound movements, like squats, rows, presses.

Can strength training help with mood, not just physical health?

Yes. Multiple meta-analyses link resistance training to meaningful reductions in depressive and anxiety symptoms, with effects seen across age groups, including specifically in older adults. The mechanism isn’t fully understood, but the effect shows up consistently across studies.

6. References

• Harvard Health – Preserve Your Muscle Mass — sarcopenia and the 3–5% per decade muscle loss rate after age 30
• Superage – Muscle Mass by Age: How Much You Lose Per Decade — postmenopausal muscle loss occurring at roughly double the rate of premenopausal women
• International Osteoporosis Foundation – Exercise and Bone Health — mechanical loading, resistance training, and bone density
• ScienceDirect – Can Resistance Training Improve Mental Health Outcomes in Older Adults? — meta-analysis on resistance training and depressive/anxiety symptoms