Of everything sold as anti-ageing, the intervention with the most consistent evidence behind it is also the least profitable to sell: lifting heavy things, regularly, for years.
What you lose, and when
Muscle mass tends to decline from around the fourth decade, and the rate accelerates later. Strength declines faster than mass, and power faster still. That ordering matters, because power is what you use to catch yourself when you trip.
The practical consequence is not aesthetic. It is that a fall at seventy is a different event from a fall at thirty, and the thing that separates those two outcomes was built decades earlier.
Muscle as metabolic tissue
Skeletal muscle is the largest site of glucose disposal in the body. More muscle, used regularly, generally means better glucose handling. This is one of the quieter arguments for resistance training in midlife, and it rarely makes the marketing.
What actually counts as enough
- Two to three sessions a week is where most of the benefit sits.
- Compound movements first: something that pushes, something that pulls, something that loads the legs, something that loads the hips.
- Load that is genuinely challenging in the last few repetitions. Comfortable sets build very little.
- Progression over months, not weeks. The adaptation is slow and that is normal.
You do not need a complicated programme. You need one you will still be doing in three years.
Protein, briefly
Training without adequate protein is a slower version of the same effort. Older adults appear to need somewhat more protein per kilogram than younger adults to get the same muscle-building response, which is the opposite of what most people assume and the opposite of how most older adults actually eat.
Spreading it across meals rather than loading it into one appears to help. That is a small change with no downside.
Where this leaves everything else
If you are not training and you are considering a compound aimed at recovery, body composition or performance, you are optimising the wrong variable. The training is the intervention. Everything else is an adjustment to it.
None of this is medical advice. If you are starting resistance training after a long break, or you have a cardiac or orthopaedic history, get cleared first.
None of that is sold in a vial, and it remains the highest-return thing on the list. If the foundations are already in place, what we hold in this area sits under strength and performance. The healthspan post makes the same case from the other direction.