Aging Doesn't Steal Your Gains. Inactivity Does.

The science of protein after 35 is actually pretty good news.

I'll admit it - when I first saw the phrase "anabolic resistance," I assumed it meant that getting older automatically meant losing muscle, recovering slower, and needing absurd amounts of protein just to keep up. It didn't sound good, and honestly seemed like a loooooot of work.

Turns out, that's not quite true, at least not if you're the kind of person reading this article.

The biology isn't the problem.

Here's the surprising finding from decades of research:

Sedentary older adults do develop anabolic resistance. They need more protein to stimulate muscle protein synthesis because their muscles become less responsive to both amino acids and exercise.

But masters (35 - 40 + years of age) athletes?

Not so much. Training appears to preserve many of the biological systems that aging would otherwise erode. Capillary density remains high, keeping amino acid delivery to the muscle relatively efficient.

The mTORC1 pathway (the signaling cascade responsible for muscle growth and repair) stays sensitive to both leucine and exercise, and chronic inflammation tends to remain lower, creating a more favorable environment for recovery. 

Father Time isn't sneaking into the gym at night to delete your gains. The couch is just getting way too many reps, or, even more simply: 

Aging doesn't steal your gains.

Inactivity does.

Two older adults. Very different biology.

Imagine two 55-year-olds.

One sits most of the day.

The other trains for marathons, triathlons or gravel races.

The sedentary adult may need 65% more protein per meal just to achieve the same muscle protein synthesis response as a young adult, while the master's athlete?

Research suggests protein requirements look remarkably similar to those of younger trained athletes. The years of training aren't fighting aging; no, they're actually protecting against it.

So how much protein should you actually eat?

The answer is simpler than Instagram would have you believe.

After hard or long sessions:

Aim for ~0.5 g/kg body weight.

At most other meals:

0.3–0.4 g/kg.

Spread over four to five meals per day, most masters athletes end up around:

~1.8 g/kg/day.

For a 70 kg athlete:

• Hard workout meal: ~35 g

• Regular meals: 20–30 g

• Daily total: ~125 g

This isn't about chasing massive protein numbers, but about consistently hitting enough.

Recovery doesn't stop when you sleep.

Neither should your protein intake.

One of the most overlooked windows isn't immediately after training - social media, science, and everything else in between has shoved the "post-exercise protein synthesis" idea down our throats for decades now.

No, what's missing is the overlooked window of overnight.

Without protein availability, muscle protein synthesis slows dramatically during sleep. With adequate amino acids available, repair and remodeling continue throughout the night.

The good news?

The source matters less than many people think.

Whey. Casein. Leucine-enriched plant proteins.

If leucine content and total protein are matched, they all appear to perform similarly.

The real issue? Most athletes don't know this.

In one recent survey, nearly 50% of masters triathletes answered the following when asked about optimal post-workout protein doses.:

"I don't know."

Only 22% got it right.

The biology isn't the problem - the knowledge gap is.

Three things to remember

Training is your protection.
Your muscle isn't aging badly. It's staying young because you train.

Hit 0.5 g/kg after hard sessions.
Then aim for 0.3–0.4 g/kg at most other meals.

Recovery is an all-day process.
And an all-night one too.

Your future self isn't built by avoiding aging.

It's built by continuing to train and fuel like the athlete you are.